Teams - Share app content to stage 501 error

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• SPFx version 1.21
• Node.js version 18.18.0

Describe the bug / error

I'm working on an in-meeting app for Teams and cannot share app content to the stage. The default share to stage functionality works (i.e share button in bottom of side panel), but a custom share button that invokes context.sdks.microsoftTeams.teamsJs.meeting.shareAppContentToStage() results in the following error:

{ "errorCode": 501, "message": "API is not supported in current context-Provided URL is invalid" }

The URL I am passing in is the tenant URL. I am following this example.

My manifest file has the following domains listed: ["{teamSiteDomain}", "<<domain-name>>", "${{TAB_DOMAIN}}"]. I've tried various combinations of other domains as well, including just using ["*"]. The error doesn't appear to be coming from a network request, so I'm guessing there's an issue with how the validDomains property is being checked (or possibly with the domains I've listed).

I have the following permissions listed:

"permissions": {
      "resourceSpecific": [
        {
          "name": "LiveShareSession.ReadWrite.Chat",
          "type": "Delegated"
        },
        {
          "name": "LiveShareSession.ReadWrite.Group",
          "type": "Delegated"
        },
        {
          "name": "MeetingStage.Write.Chat",
          "type": "Delegated"
        },
        {
          "name": "OnlineMeeting.ReadBasic.Chat",
          "type": "Application"
        },
        {
          "name": "ChannelMeeting.ReadBasic.Group",
          "type": "Application"
        }
      ]
    }

and the following contexts:

"context": [
        "channelTab",
        "privateChatTab",
        "meetingSidePanel",
        "meetingDetailsTab",
        "meetingChatTab",
        "meetingStage"
      ]

I wasn't sure if this is an SPFx issue or a TeamsJS issue. I've opened a ticket there as well. Thank you!

Steps to reproduce

1. Create an SPFx Teams in meeting app
2. Enable custom share to stage in the manifest.json file "supportsCustomShareToStage": true
3. Invoke `shareAppContentToStage(() => {}, {tenantUrl})

Expected behavior

In meeting app opens for each user in the stage context.