Home Assistant Cast throws unknown error after authentication

I browse to https://cast.home-assistant.io/ and insert my HA URL with https (it is running behind an Nginx server). when i click authorise, it takes me to the HA login screen, i login which redirects me back to https://cast.home-assistant.io/ and it throws an ‘Unknown error (TypeError: Failed to fetch).’

Can anyone help?

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Did you ever find a resolution to this issue? I have the same setup and basic problem.