Not able to login through Remote UI - only internal

Dear all,

I have tried to setup the remote UI to be able to access my HA from outside. So far, this has failed all the time. All authentication with MFA seems to work fine (also from internal) but from external I always get the “START OVER” button.

Am I missing some whitelisting somewhere or could somebody please point me in the right direction? I read somewhere that the cloud: should be added in the configuration.yaml. This has also been tested unsuccessfully.

Thanks for any input.

Br,
Jacob