iPad always syncs with an old Dropbox account

I am having a Dropbox synchronization problem with Joplin on iPad.

Environment

  • Windows Joplin: 3.6.15
  • iPad Joplin Mobile: 13.6.10
  • Sync target: Dropbox

Problem

My Windows PC and Android phone both synchronize correctly with the same Dropbox account.

However, my iPad always synchronizes with a different Dropbox account that I used when I first installed Joplin.

The iPad displays:

  • 27 notes
  • 6 notebooks

The Windows PC displays:

  • 13 notes
  • 3 notebooks

The iPad log shows:

  • Synchronisation finished successfully.
  • Total notes: 27
  • Total folders: 6
  • E2EE is disabled.

This proves that the iPad is synchronizing successfully, but it is synchronizing with the wrong Dropbox account.

What I have already tried

  • Deleted and reinstalled Joplin several times.
  • Removed Safari website data.
  • Changed the Dropbox account in the Dropbox app to the correct account.
  • Set the sync target to "None" and back to Dropbox.
  • Re-authorized Dropbox.
  • Restarted the iPad multiple times.

None of these steps changed the behavior.

Additional information

When I first installed Joplin on the iPad, I authenticated it with a different Dropbox account. I no longer want to use that account.

Despite reinstalling Joplin, the iPad still synchronizes with that old Dropbox account. I never get a Dropbox account selection screen again, and there seems to be no way to clear the stored Dropbox authorization.

Is there any way to completely remove the stored Dropbox OAuth credentials or force Joplin Mobile to authorize a different Dropbox account?

Thank you for your help.

log:

Synchronizer: Total folders: 6

Synchronizer: Total notes: 27

Synchronizer: Sync: finished: Synchronisation finished

The Windows client synchronizes with Dropbox account A (13 notes, 3 notebooks), while the iPad always synchronizes with Dropbox account B (27 notes, 6 notebooks), even after deleting and reinstalling Joplin multiple times.