Den Anweisungen im Plugin bist Du gefolgt und hast selber eine "App" registriert?
Create an application via the Home Connect Developer Program, ensuring that:
- OAuth Flow is set to Device Flow
- Home Connect User Account for Testing is the same as the SingleKey ID email address
- Redirect URI is left blank
- Enable One Time Token Mode is not ticked
If the application is subsequently edited then additionally ensure that:
- Forces the usage of PKCE is not ticked
- Status is Enabled
- Client Secret Always Required is No
Wait 15 minutes after creating (or editing) an application for changes to the application to be deployed to the Home Connect authorisation servers.