Trouble with Office 365 (Outlook/MS Exchange Email) and Microsoft Account using same email?

[_clef]

Hello, I have a problem with a recently migrated email being hosted via Rackspace MS Exchange and Outlook 2016 giving some temporary mailbox prompt on app open and Rackspace is saying the email I am using for my master live account needs to be different than the email used in Outlook with MS exchange. This has been a real nightmare for me and I am wondering what people in the Microsoft community have to say about this and/or if anyone has any familiarity with this and/or if anyone has any other solutions.

Thanks

[#2]

Hello @_clef , 

I think the only available solution is to rename your personal account, Here are couple of relevant articles :

Background:

https://techcommunity.microsoft.com/t5/azure-active-directory-identity/cleaning-up-the-azuread-and-m...

Rename :

https://support.microsoft.com/en-gb/help/12407/microsoft-account-change-email-phone-number

Thanks