Modern Authentication is turned on by default for new tenants, but if you have legacy tenants or take over tenants from others MSP’s than sometimes you might have tenants that do not use Modern Authentication yet.

Monitoring and auto remediation is key in this when using Multi factor Authentication. We want the best user experience, so we must have it enabled to make sure users get a nice looking pop-up in outlook. also we want to avoid using App Passwords.

PowerShell Monitoring script:

This script only monitors the Modern Auth status, and does not auto-remediate.

$creds = get-credential
Connect-MsolService -Credential $creds
$clients = Get-MsolPartnerContract -All
 
foreach ($client in $clients) { 
 $ClientDomain = Get-MsolDomain -TenantId $client.TenantId | Where-Object {$_.IsInitial -eq $true}
 Write-host "Logging into portal for $($client.Name)"
 $DelegatedOrgURL = "https://ps.outlook.com/powershell-liveid?DelegatedOrg=" + $ClientDomain.Name
 $ExchangeOnlineSession = New-PSSession -ConnectionUri $DelegatedOrgURL -Credential $credential -Authentication Basic -ConfigurationName Microsoft.Exchange -AllowRedirection
 Import-PSSession -Session $ExchangeOnlineSession -AllowClobber -DisableNameChecking
 
 $Oauth = Get-OrganizationConfig 
 
 if($Oauth.OAuth2ClientProfileEnabled -eq $false){ $ModernAuthState += "$($ClientDomain.name) has modern auth disabled"}
 
 Remove-PSSession $ExchangeOnlineSession
}

if(!$ModernAuthState){ $ModernAuthState = "Healthy"}

PowerShell auto-remediation script

$creds = get-credential
Connect-MsolService -Credential $creds 
$clients = Get-MsolPartnerContract -All
 
foreach ($client in $clients) { 
 $ClientDomain = Get-MsolDomain -TenantId $client.TenantId | Where-Object {$_.IsInitial -eq $true}
 Write-host "Logging into portal for $($client.Name)"
 $DelegatedOrgURL = "https://ps.outlook.com/powershell-liveid?DelegatedOrg=" + $ClientDomain.Name
 $ExchangeOnlineSession = New-PSSession -ConnectionUri $DelegatedOrgURL -Credential $credential -Authentication Basic -ConfigurationName Microsoft.Exchange -AllowRedirection
 Import-PSSession -Session $ExchangeOnlineSession -AllowClobber -DisableNameChecking
 
 $Oauth = Get-OrganizationConfig 
 
 if($Oauth.OAuth2ClientProfileEnabled -eq $false){ Set-OrganizationConfig -OAuth2ClientProfileEnabled $true }
 
 Remove-PSSession $ExchangeOnlineSession
}

And that’s it! Hope it helps and as always, Happy PowerShelling.