Note that if you are a steam authenticating user, I found a workaround for when your browser is opened and you are prompted to login using Frontier username/pass rather than steam. When this happens, you will notice that your frontier login/pass fails to get you logged in.
In the URL which EDMC opens there is a property named "audience" and it is set to "frontier" (see example just below)
I simply changed that part to audience=steam, not changing any other element and it actually worked. I was directed to Steams authentication and was able to grant EDMC permission and am back up and running.
In the URL which EDMC opens there is a property named "audience" and it is set to "frontier" (see example just below)
Code:
https://auth.frontierstore.net/auth?response_type=code&[B]audience=frontier[/B]&scope=capi&client_id