Outlook 2016 and Office 365 settings

[mdrabble]

I've migrated some users from on premise exchange 2013 to Office 365 without issue....

 

When they use outlook 2016, it picks up their smtp address user@domain no problem, but it prompts for logon credentials using [email protected] instead of username@domain which means unless they change it, they cannot login to outlook 2016.

 

What is the best way of sorting this?

 

Cheers

[Steve21]

It's one of the AD fields it pulls it from, without being able to check our server I want to say it's the UPN

 

Might want to test it on a test user but sure that's what outlook pulls for the default

 

Steve