Home Connect API integration error

I have set up an Home Connect app through their developer program and followed the guide from: https://www.home-assistant.io/integrations/home_connect

When adding the integration using the user interface, the wizard comes up with an error. ‘Unauthorized_client’ and ‘request rejected by client authorization authority (developer portal)’. Can see that the URL refers to the wrong redirect URL, which cannot be changed during setup.

‘… redirect_uri=Link to OAuth2 Authorize Callback – My Home Assistant …’

What am I doing wrong and how do I set it up correctly? It has been installed for a long time and ran flawlessly for a few years, but since Home Connect has switched to Single Key login there have been challenges.

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I have the same problem