I'm not sure if it was something in an office update or not...but we started receiving a popup in outlook saying this feature has been blocked by your administrator. I comes back up at times. Meanwhile there's a Need Password message on the bottom bar in Outlook. It goes away when I click on it. I figured that the login box that asks for my credentials is the feature being blocked. We're able to send and receive emails. I have deleted auto discovery files, and as well as the credentials in credential manager. I checked group policy and we are blocking logging into Office. But I think this has always been enabled.
I have a test ou where I disabled this setting, and im now being prompted to login, but its for office 365. We're still on Exchange 2019, until we migrate to office 365 in a few months. I was wondering if anyone else has seen this error before.