Welcome to the forum @ricm
What sent you there? Usually you’d just click the AuthID link in the GUI Destination screen:
Replacing the OAuth service shows you’re likely on a test server Duplicati isn’t using without.
--oauth-url (String): Alternate OAuth URL
Duplicati uses an external server to support the OAuth authentication flow. If you have set up your own Duplicati OAuth server, you can supply the refresh URL.
* default value: https://duplicati-oauth-handler.appspot.com/refresh
You can use that option to test if the OAuth server you used (be careful where you go) has it.
To get to the production server (unless it finally moved), use Duplicati GUI or use this instead: