Not sure this is realy something that I can be helped with through this channel, but I'll give it a go.
I use a dedicated account for powerBI (as I couldn't use my primary 'personal' account), and so signed up with myname@mydomain..com
No problems there
However, the other day, I changed the account to powerbi@mydomain.com (so same domain), but can no longer log into PowerBI. I get 'We don't recognize this user ID or password'
I can log into the account fine through account.microsoft.com - and have tried changing password, changing security backup numbers etc - but I still can't get back into my PBI account.
Any suggestions?