M365 and Multi-step Authentication (MFA)

27 January 2021

If you have recently enabled Multi-factor authentication on your Microsoft 365 tenant, your Outlook 365 client users may be continually prompted for their password.

At the top of your list should be checking the tenant configuration.

# These steps make an assumption your Windows PowerShell client
# has the proper modules installed
Connect-ExchangeOnline
Get-OrganizationConfig | Select-Object OAuth*

OAuth2ClientProfileEnabled
-------------------------
                    False

Set-OrganizationConfig -OAuth2ClientProfileEnabled $true

Get-OrganizationConfig | Select-Object OAuth*

OAuth2ClientProfileEnabled
--------------------------
                      True

Test an Outlook client to see if the issue has been resolved. (Note, it could take up to an hour to propagate the configuration change).