We have some users that created their own Microsoft account (private) using their email-address from work. In many cases this is the same as the UPN.
Now two years later we have started using our tenant and given the users their microsoft account by their UPN (work).
For the users in questions they now have two different Microsoft accounts with the same UPN. This is of course not ideal.
We have tried to change the email-address of the private account. This did not solve the issue. Have also tried on one account to remove the work-account completely from azure AD, intune and office 365 before we added the user again. This did not solve the issue.
When adding a user to a team there is now two versions of the same person. Only one of them is possible to add to the team
When trying to migrate (to exchange online) a user that we have tried to clean up this way. The user is not visible as the full name, only the samaccountname
We would really like a recipe for the steps to follow to fix this for the users affected.