I once used custom Domains in Live. Since the my primary Alias always was the one with the custom domain. Because I use the same Domain for Office365 Business/Azure/.. Services I sometimes have login problems (if i'd like to login to a AAD Service the login server doesn't recognize that it's no a live ID).

Solution would be easy - change primary Alias, but that's not possible. I always get the Error Message

"We were unable to make ****** your primary alias. Please try again later." - and I tried it later...... (Minutes, Hours, Days, Months)

I've contacted Chat-Support but I think they just didn't get my problem and they cut off the Chat.

Thanks,

Oliver