OfficeDev/office-js

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A repository for issues related to the Office JavaScript APIs and Office Add-ins platform. Find the Office.js library in Office.js CDN: https://appsforoffice.microsoft.com/lib/1/hosted/office.js.

Stars: 845
Forks: 124
Open beginner issues: 0
Indexed issues: 868
Avg merge: 3d 17h
Merged PRs (30d): 1

Dominant language: JavaScript
License: No license data
Last GitHub push: Sep 9, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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868 open issues indexed

Co-authoring tears down a task pane add-in's runtime when a second co-author joins (both sideloaded) Open

Area: Word Needs: attention :wave:

OfficeDev/office-js#6958 · 2 comments · 1 assignee · Opened Sep 18, 2026
OnNewMessageCompose handler not invoked in OWA and New Outlook for Mac Open

Area: Outlook Mac Needs: attention :wave: New Outlook Platform: Online Type: product bug

OfficeDev/office-js#6956 · 1 assignee · Opened Sep 18, 2026
Add-in Error banner RETRY button obscured by long translated text in non-English locales when Office.js CDN is unreachable Open

Area: Outlook

OfficeDev/office-js#6955 · 1 assignee · Opened Sep 18, 2026
Classic Outlook on Windows: draft body is lost when a send is blocked by an on-send (ItemSend) add-in, and also when a pop-out compose window is simply closed and saved (16.0.20326.20132 / .20144) Open

Area: Outlook Win32

OfficeDev/office-js#6954 · 1 assignee · Opened Sep 18, 2026
Outlook on the web intermittently builds a mail window without activating an installed add-in — no add-in iframe is created and no request is made to the add-in host Open

Area: Outlook Platform: Online

OfficeDev/office-js#6953 · 1 assignee · Opened Sep 17, 2026
Store add-ins do not load. "Add-in error". 50+ customer reports Open

Area: Excel Needs: attention :wave: Needs: triage :mag: regression

OfficeDev/office-js#6952 · 5 comments · 2 assignees · Opened Sep 17, 2026
getSelectedItemsAsync includes mails in draft mode, but itemMode reports "Read" instead of "Compose" Open

Area: Outlook Needs: attention :wave: Type: product bug

OfficeDev/office-js#6951 · 1 assignee · Opened Sep 17, 2026
Word for Mac: AppSource add-in shows "This add-in could not be started" on first click after launch, then loads under the error (ValidateAppState 0x80043273) Open

Area: Word Needs: attention :wave:

OfficeDev/office-js#6950 · 3 comments · 1 assignee · Opened Sep 17, 2026
Word on the web: task pane loads empty (no JS executes) after closing and reopening, without full page refresh — not reproducible in Excel/PowerPoint on the web Open

Area: Word Needs: attention :wave: Type: product bug

OfficeDev/office-js#6949 · 4 comments · 3 assignees · Opened Sep 16, 2026
PowerPoint customXmlParts.getByNamespace.getItemOrNullObject throws instead of creating a null object. Open

Area: PowerPoint Needs: attention :wave: Type: product bug

OfficeDev/office-js#6948 · 3 comments · 1 assignee · Opened Sep 16, 2026
OnMessageSend is never re-dispatched after the user clicks "Undo send"; next Send stalls for the full 5-minute host cap (SoftBlock) Open

Needs: attention :wave: New Outlook Type: product bug

OfficeDev/office-js#6947 · 1 assignee · Opened Sep 16, 2026
Cannot Set Annotation Critique Popup Text In Word Add-In Open

Area: Word Needs: triage :mag:

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OfficeDev/office-js#6957 · 5 comments · Opened Sep 16, 2026
Taskpanes taking forever to load Open

Area: Excel Needs: attention :wave:

OfficeDev/office-js#6946 · 7 comments · 6 reactions · 1 assignee · Opened Sep 16, 2026
Outlook on Mac: OnMessageSend event runtime not started for minutes after Send, and restarted repeatedly Open

Area: Outlook Mac Needs: attention :wave: Platform: macOS

OfficeDev/office-js#6945 · 6 comments · 1 assignee · Opened Sep 15, 2026
body.setAsync silently truncates HTML body containing many inline attachments; failed send then discards or empties the draft body (new Outlook on Windows) Open

Area: Outlook

OfficeDev/office-js#6944 · 1 assignee · Opened Sep 15, 2026
Excel.createWorkbook() opens new workbook window in background on Excel for Mac (works correctly on Windows) Open

Area: Excel Needs: attention :wave:

OfficeDev/office-js#6943 · 3 comments · 1 assignee · Opened Sep 15, 2026
<EquivalentAddin> Does not Prevent JS add-in Dialog (Office.context.ui.displayDialogAsync) from Opening Open

Area: Excel

OfficeDev/office-js#6941 · 3 comments · 2 assignees · Opened Sep 14, 2026
Word: insertOoxml fails with 0x80004005 and a "cannot open msoXXXX.tmp" dialog Open

Area: Word

OfficeDev/office-js#6940 · 1 comment · 1 assignee · Opened Sep 13, 2026
Can not install addin having flight code Open

Area: Excel Needs: attention :wave:

Difficulty 4/5 3-5 days Newbie friendliness 28/100

OfficeDev/office-js#6939 · 3 comments · Opened Sep 11, 2026
Adding a button from a web add-in to the Quick Access Toolbar on Mac is not persisted Open

Area: add-in UI Mac Needs: attention :wave: Platform: macOS

OfficeDev/office-js#6937 · 2 comments · 1 assignee · Opened Sep 11, 2026
Excel custom functions have significant performance degradation when the add-in task pane is closed Open

Area: custom functions Area: Excel Status: fix pending

OfficeDev/office-js#6936 · 3 comments · 2 assignees · Opened Sep 11, 2026
extensions.alternates.hide.customOfficeAddin works for Outlook but not for Word/Excel/PowerPoint (desktop and web) Open

Area: add-in UI Needs: attention :wave: Platform: Desktop Type: product bug Win32

OfficeDev/office-js#6938 · 6 comments · 1 assignee · Opened Sep 10, 2026
Excel for Mac intermittently fails to start a shared-runtime add-in that previously worked correctly for the affected user, leaving custom functions prefixed with `_xldudf_` with `#NAME?` Open

Area: Excel Status: under investigation

OfficeDev/office-js#6935 · 2 comments · 2 assignees · Opened Sep 10, 2026
[Outlook Mac] from.getAsync returns primary address after shared mailbox to alias switch until alias is selected again Open

Area: Outlook Mac Platform: macOS

OfficeDev/office-js#6934 · 1 assignee · Opened Sep 10, 2026
PowerPoint: TextRange.font.color / underline do not visually override hyperlink theme formatting Open

Area: PowerPoint

OfficeDev/office-js#6933 · 1 comment · 1 assignee · Opened Sep 9, 2026
Excel add-in's custom functions intermittently remain in a busy/loading state after successfully supplying a result, blocking dependent formulas Open

Area: custom functions Area: Excel Needs: attention :wave: Status: under investigation

OfficeDev/office-js#6930 · 5 comments · 2 assignees · Opened Sep 9, 2026
Office.extensionLifeCycle.taskpane.setWidth animation is flickering on Windows Open

Area: Word

OfficeDev/office-js#6928 · 1 comment · 1 reaction · 1 assignee · Opened Sep 9, 2026
Excel task pane "Trust this add-in" prompt not appearing on first install Open

Area: Excel Needs: attention :wave:

OfficeDev/office-js#6927 · 4 comments · 1 assignee · Opened Sep 8, 2026
Office URI Scheme: ms-word:ofv (Open For View) does not open documents in read-only mode - identical to ofe Open

Area: Word Platform: Desktop Status: Internally Assigned Win32

OfficeDev/office-js#6926 · 5 comments · 2 assignees · Opened Sep 8, 2026
Excel intermittently shows “This add-in could not be started” for an established add-in user Open

Area: Excel Needs: attention :wave:

OfficeDev/office-js#6925 · 5 comments · 1 assignee · Opened Sep 7, 2026
New Outlook for Mac: sideloaded task pane never initializes — host launches legacy `Outlook$Mac$16.00` with a two-method `window.external` bridge, `Office.onReady` never fires Open

New Outlook

OfficeDev/office-js#6923 · 1 assignee · Opened Sep 5, 2026
Excel desktop 16.0.20326.20132: Office.js Application.calculationMode setter is silently ignored (readback stays Automatic; COM setter and other application setters work) Open

Area: Excel Needs: attention :wave: regression Status: fix pending waiting for customer response

OfficeDev/office-js#6922 · 3 comments · 1 assignee · Opened Sep 5, 2026
Add-in not loading after a new version is released Open

Area: Centralized Deployment Needs: attention :wave: regression

OfficeDev/office-js#6921 · 7 comments · 2 assignees · Opened Sep 3, 2026
Having an open Office dialog causes custom formulas to hang Open

Area: custom functions Area: Excel Status: fix pending

OfficeDev/office-js#6920 · 4 comments · 2 assignees · Opened Sep 3, 2026
Outlook for Mac] setSelectedDataAsync inserts HTML at top of compose body instead of cursor position (New Outlook GUI only) Open

Area: Outlook Mac Needs: attention :wave: Platform: macOS

OfficeDev/office-js#6919 · 3 comments · 1 assignee · Opened Sep 3, 2026
What is the supported pattern for an OnMessageSend add-in that updates and sends the message through Microsoft Graph in New Outlook for Windows? Open

New Outlook

OfficeDev/office-js#6916 · 1 assignee · Opened Sep 1, 2026
[Word for Mac] Critique annotation underlines render as a double line for every CritiqueColorScheme Open

Area: Word Needs: attention :wave: regression

OfficeDev/office-js#6915 · 6 comments · 1 reaction · 2 assignees · Opened Sep 1, 2026
[Feature Request/API] Request for OnDestroy / Cleanup Callback API when Smart Alerts dialog is closed or cancelled Open

Area: Outlook

OfficeDev/office-js#6914 · 1 assignee · Opened Sep 1, 2026
Powerpoint contenttype addin does not open in mac Open

Area: PowerPoint regression

OfficeDev/office-js#6913 · 2 comments · 1 assignee · Opened Aug 31, 2026
Office.context.officeTheme is stale at task pane load after an in-session appearance change (Outlook Web, Mac, new Outlook for Windows) Open

Area: Outlook

OfficeDev/office-js#6912 · 1 assignee · Opened Aug 31, 2026
Feature request: allow cancelling/aborting an in-flight Word.run / RequestContext.sync() call Open

Area: Word Needs: attention :wave:

OfficeDev/office-js#6909 · 1 comment · 1 assignee · Opened Aug 28, 2026
prependOnSendAsync/appendOnSendAsync called from OnMessageSend: succeeds but no-ops on first send, fails with undocumented error 9032 on retry Open

Area: Outlook

OfficeDev/office-js#6908 · 1 assignee · Opened Aug 28, 2026
PowerPoint: no way to select or reach a TextRange for text inside a table cell — TableCell has no textRange/setSelected, and Shape.textFrame throws for table shapes Open

Area: PowerPoint

OfficeDev/office-js#6906 · 2 comments · 3 reactions · 1 assignee · Opened Aug 27, 2026
Word JavaScript API — AccessDenied on all document write operations (Document.close, header/footer edits) Open

Area: Word Needs: author feedback Status: fixed

OfficeDev/office-js#6907 · 21 comments · 4 assignees · Opened Aug 27, 2026
Bug: `item.displayReplyFormAsync` fails only in new Outlook on Windows (`ErrorNonExistentMailbox`) Open

Area: Outlook New Outlook

OfficeDev/office-js#6905 · 1 assignee · Opened Aug 26, 2026
[Word for Mac] Range.insertOoxml turns trailing plain paragraph into empty numbered item Open

Area: Word Similar-Issue

OfficeDev/office-js#6904 · 3 comments · 2 assignees · Opened Aug 22, 2026
[Word for Mac] insertOoxml applies list numbering to deleted table-cell paragraphs Open

Area: Word Similar-Issue

OfficeDev/office-js#6903 · 3 comments · 2 assignees · Opened Aug 22, 2026
Office on the web does not delegate the `autoplay` Permissions Policy to add-in iframes, so unmuted `video.play()` rejects with NotAllowedError Open

Area: PowerPoint

OfficeDev/office-js#6902 · 1 comment · 1 assignee · Opened Aug 21, 2026
getSelectedItemsAsync does not represent current selection of messages in Outlook when grouped by conversation Open

Area: Outlook Needs: attention :wave: New Outlook

OfficeDev/office-js#6901 · 2 comments · 1 assignee · Opened Aug 20, 2026
Folder upload confirmation dialog (webkitdirectory) is clipped/off-center on narrow Excel task pane widths Open

Area: Excel Needs: attention :wave:

OfficeDev/office-js#6900 · 2 comments · 1 assignee · Opened Aug 19, 2026

OfficeDev/office-js

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