I log in with my personal Microsoft Account. (MSA) The account ID is firstname.lastname@example.org. I would like my contact email address (listed under My Settings > Personal > Email to be email@example.com.
I can make the change, get the confirmation email, verify it through the link and have it appear there but for some reason at some point it reverts back to firstname.lastname@example.org.
This has happened to me at least three times now.
Things that might be relevant:
My MSA primary (and only) alias used to be email@example.com
I recently created an Office 365 tenant and tied it to my redhax.com domain
I added the firstname.lastname@example.org alias to my MSA and made it the primary alias to enable me to log on to certain services that have problems differentiating between the personal and work account when my email@example.com ID is used
I migrated my emails from my Outlook.com mailbox to my Exchange Online mailbox; the only service still emailing my firstname.lastname@example.org mailbox (since the address was never publicised anywhere apart from being my new primary logon ID) is this Tech Community site