Add Dropbox (restricted) triggers Microsoft .NET Framework Unhandled exception after clicking "Allow"

[shanemcandrewai]

Describe the bug
Add Dropbox (restricted) triggers Microsoft .NET Framework Unhandled exception after clicking "Allow"

To Reproduce

Steps to reproduce the behavior:

1. Open Keepass, tools > keeAnywhere settings ... > Add > Dropbox (restricted)
2. browser opens
3. sign in to dropbox
4. See KeeAnywhere [AppFolder only] would like to: View basic information about your Dropbox account such as your username, email, and country
5. Click Allow
6. See Received verification code. You may now close this window.
7. Receive small pop error window

Microsoft .NET Framework
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
Dropbox.Api.OAuth2Exception: invalid_request
at Dropbox.Api.DropboxOAuth2Helper.d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
...

Expected behavior
On my old laptop and computer, my keepass file is synced with dropbox using KeeAnywhere without errors.
I only see this error on my new laptop. I tested KeeAnywhere configured for OneDrive and it worked fine

Screenshots

Environment:

• OS and Version: Windows 11 Home 25H2
• KeePass-Version: 2.61
• KeeAnywhere-Version: 2.1.0

Additional context
Add any other context about the problem here.

[HarryHuy]

It seems that Dropbox recently tightened its OAuth 2.0 authentication protocols.

[shanemcandrewai]

It seems that Dropbox recently tightened its OAuth 2.0 authentication protocols.

Is there a workaround?