Hello,
I have come across an issue where a user has an O365 account, but has accidentally setup a Microsoft Account with the same alias as their O365 work account. For their desktop machines this has not caused any problems, however for their mobile device (Samsung S4) the Outlook App cannot connect to the users O365 account. What happens is, I install the Outlook App on to the Samsung, go to setup a new account, select 'Exchange' and enter the user's O365 credentials. The credentials appear to get accepted, but then it takes me to a 're-enter your password' screen, and it is on this screen that it demands Microsoft Account credentials to proceed. When I entered the user's MSAccount creds the Outlook App connects to the outlook.com mailbox as opposed to the user's O365 work account - Which is not what we want, we want to connect to the user's O365 work mailbox.
As part of my troubleshooting I have changed the alias for the MSAccount to no longer be the same as the user's O365 email address, but that made no difference. I have now gone so far as to remove the user's Microsoft Account, but still when I try to setup the user on their Samsung with the Outlook App it demands I also enter the MSAccount creds to proceed. I have tried this on a different phone to confirm it's a behaviour of the account and not something strange on the phone.
Note that if I setup the user on the native mail client for Android, it successfully connects to the O365 account and does not get confused by any MSAccount; it is only in the Outlook App for Android that I get the unexpected prompt for MSAccount creds. Unfortunately, company policy requires users to have the Outlook App and not to use the email native client.
Any help would be great! Regards, nel05