Unable to sync with Notes on Pixel 10 Pro with GrapheneOS

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Notes Android app, neither the Notes server app nor the Nextcloud Android app.

Describe the bug

Fresh install of Nextcloud Notes on my father's Pixel 10 Pro with GrapheneOS through F-Droid store. Connected the Nextcloud account and initial sync was successful. However, when creating a new note, it won't sync but only give following error:

App Version: 34.0.1
App Version Code: 340000190
App Flavor: fdroid

Files App Version Code: 340010090 (PROD)

---

OS Version: 6.6.142-android15-8-g163b28abb786-4k(2026081301)
OS API Level: 37
Device: blazer
Manufacturer: Google
Model (and Product): Pixel 10 Pro (blazer)

---

java.lang.Exception: {"errorType":"Exception"}
[com.nextcloud.android.sso.InputStreamBinder.processRequestV2(InputStreamBinder.java:440), com.nextcloud.android.sso.InputStreamBinder.performNextcloudRequestAndBodyStreamV2(InputStreamBinder.java:113), com.nextcloud.android.sso.InputStreamBinder.performNextcloudRequestV2(InputStreamBinder.java:96), com.nextcloud.android.sso.aidl.IInputStreamService$Stub.onTransact(IInputStreamService.java:112), android.os.Binder.execTransactInternal(Binder.java:1425), android.os.Binder.execTransact(Binder.java:1377)]
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:150)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:99)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:520)
	at java.util.concurrent.FutureTask.run(FutureTask.java:328)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1100)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:1572)


java.lang.Exception: {"errorType":"Exception"}
[com.nextcloud.android.sso.InputStreamBinder.processRequestV2(InputStreamBinder.java:440), com.nextcloud.android.sso.InputStreamBinder.performNextcloudRequestAndBodyStreamV2(InputStreamBinder.java:113), com.nextcloud.android.sso.InputStreamBinder.performNextcloudRequestV2(InputStreamBinder.java:96), com.nextcloud.android.sso.aidl.IInputStreamService$Stub.onTransact(IInputStreamService.java:112), android.os.Binder.execTransactInternal(Binder.java:1425), android.os.Binder.execTransact(Binder.java:1377)]
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.pushLocalChanges(NotesServerSyncTask.java:150)
	at it.niedermann.owncloud.notes.persistence.NotesServerSyncTask.run(NotesServerSyncTask.java:99)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:520)
	at java.util.concurrent.FutureTask.run(FutureTask.java:328)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1100)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:1572)

Expected behavior

No response

Notes Android version

34.0.1

Notes server version

6.0.2

Nextcloud Android version

34.1.0

Nextcloud version

34.0.3

Device

Google Pixel 10 Pro

Android Version

17

App Store

• Google Play Store
• F-Droid
• Huawei App Gallery

Stacktrace

No response

Start with NotesServerSyncTask.java, especially pushLocalChanges at line 150 and run at line 99, then reproduce creating a note on the listed Pixel 10 Pro and GrapheneOS setup. Trace the Nextcloud request failure and compare it with the successful initial sync. Done means newly created notes sync successfully without the reported exception.