Instead, it re-prompts me to enter the credentials. When I try to add my Office 365 account to Outlook, it constantly rejects the credentials I enter. When I try to add another account in Windows 10 for Exchange using the same email, it tells me that email is already in use. I login to Windows 10 with my MSA account. Within Windows 10 => Settings => Accounts, I see my MSA account listed as 'Outlook' and can firm it's using a Hotmail server to sync. Outlook 2016 latest (installed from Office 365.I have an Office 365 account with the email I have an old MSA account with the email Windows 10 - Creators Update (but tried this with a fully patched version immediately before updating to Creators Update.I have three more migrations over the next couple months, so any suggestions y'all have would be appreciated. I'm at a loss at what is causing Outlook to not connect to Office 365. I've created a non-AD synced user and tried with that profile to test it's not a problem with the AD attributes coming over the sync.I've tried using registry edits to ignore any and all of the various stages of Autodiscover.I've tried created a new local Windows profile and creating the Outlook profile there.I've tried uninstalling Office using the uninstall tool provided my Microsoft and reinstalling Office.You get the picture, basically trying to rule out that a Domain level autodiscover issue is the problem, because that's bit me in the but.I've tried creating a profile on the network on my own machine, and off the network on the client's machine.

I have tried to create a profile off the client's network on my own machine.I've tested that Autodiscover itself is healthy using and by adding profiles on my phone off the network.I've sunk a good 8 hours of troubleshooting, and so far I've had no luck. It's causing a lot of confusion, frustration, and probably hair loss. However, I need to determine what is causing this problem. In most cases I've used the Microsoft Support and Recovery Assistant to work around this. In each I have had problems with Office 2016 not connecting to Autodiscover and thus Outlook won't create the profile. I have recently performed three Exchange to Office 365 Migrations.

Office 365 mail server for outlook 2016