When MFA is enabled in Office 365 then the standard connection method (https://docs.microsoft.com/en-us/powershell/exchange/exchange-online/connect-to-exchange-online-powershell/connect-to-exchange-online-powershell?view=exchange-ps) will not work. Instead the instructions here need to be followed: https://docs.microsoft.com/en-us/powershell/exchange/exchange-online/connect-to-exchange-online-powershell/mfa-connect-to-exchange-online-powershell?view=exchange-ps TIP – Install the downloaded module by using internet explorer. Blocked on some other browsers and will not install Then Open Powershell Connect-EXOPSSession [-UserPrincipalName -ConnectionUri -AzureADAuthorizationEndPointUri -DelegatedOrganization ] Connect-EXOPSSession -UserPrincipalName […]