How to force Outlook 2016 to change password
Symptom: You have enabled 2FA on O365. Your apple phone has already prompted for password. But Outook just says disconnected.
Control Panel, Search for "Cred"
Click on Manage Windows Creds
Under Generic Credentials
Click on MicrosoftOffice2016_Data:SSPI..., then Remove
Start Outlook and input app password