outlook login problem from mac – Microsoft Community

If not, please perform the following steps: Make sure you quite Outlook and other Office apps. Go to KeyChain Access Search “Exchange” under Login –> All Items and delete everything Search “Office” and delete everything Search “ADAL” and delete everything Launch Outlook Meanwhile, Microsoft has a dedicated support channel for Outlook for Mac …

https://answers.microsoft.com/en-us/outlook_com/forum/all/outlook-login-problem-from-mac/0b992505-72a1-4738-a0a8-4a9b8e8c47fd