Attempting to connect to MSOnline via Connect-MsolService with MFA enabled fails with: “This account is blocked. Contact your Tenant administrator.”
Problem You attempt to use PowerShell to connect to MSOnline via the cmdlet Connect-MsolService but it fails and displays the following message: PS C:> Connect-MsolService Connect-MsolService : This account is blocked. Contact your Tenant administrator. At line:1 char:1 + Connect-MsolService + ~~~~~~~~~~~~~~~~~~~ + CategoryInfo :