If I go here on my regular browser, https://auth-xxxxxx.buildinglink.com/Account/Login and login, I see my account (at https://xxxxxx.buildinglink.com/V2/Tenant/Home/DefaultNew.aspx after some https://auth-xxxxxx.buildinglink.com/connect/authorize/callback?client_id=… for the authorization process).
If I do the same login through LAM Playground web, I am logged in but not to the usual account view, instead I am merely at https://auth-xxxxxx.buildinglink.com and I see an unexpected message:
Welcome to BuildingLink Auth Server
Auth Server publishes a discovery document where you can find metadata and links to all the endpoints, key material.
Click here to manage your stored grants.
This is almost certainly at the bottom of your list of priorities but in case it’s an edge case you wish to explore, let me know. Thanks.