My Home Assistant redirector is not running

I’m having trouble to set up integration myUplink ( myUplink - Home Assistant ), that uses callback URL: Link to OAuth2 Authorize Callback – My Home Assistant

Unfortunately when setting this integration via Home Assistant GUI, I get to the point, where the myUplink asks me to confirm access, but then I get error that the My Home Asistant is not set up yet:

I’ve tried to add my: to the configuration.yaml, but the error is still there (default_config: is also present). My Home Assistant installation is a few years old running on esx hypervisor, but it is updated to the last versions.

My Home Assistant integration: My Home Assistant - Home Assistant