OAuth not working

[Klassenlehrer161]

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Steps to reproduce

1. Install the integration
2. Create Dropbox app with 3 requested read permissions
3. Enter key and secret in Nextcloud settings

Expected behaviour

Data Migration in User Settings should allow import of files from Dropbox

Actual behaviour

Clicking on Data Migration throws an error message: Failed to get Dropbox storage information
Log entry: Dropbox OAuth error : Client error: 'POST https://api.dropboxapi.com/oauth2/token' resulted in a '400 Bad Request' response: {"error": "invalid_grant", "error_description": "refresh token is invalid or revoked"}

Server configuration

Web server: Nginx

Database: MariaDB

PHP version: 8.2.27

Nextcloud version: Nextcloud Hub 9 (30.0.4)

Browser

Browser name: LibreWolf

Browser version: 134.0-1

Operating system: Fedora 41