Connect to Exchange Online - PowerShell Mode

Powershell Command to check whether Modern Authentication is enabled or not?

Connect to Exchange Online - using elevated PowerShell command run the following:

$UserCredential = Get-Credential

In the Windows PowerShell Credential Request dialog box, type your work or school account and password, and then click OK.

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

Import-PSSession $Session -DisableNameChecking

Get-OrganizationConfig | ft name, *OAuth*

Name                     OAuth2ClientProfileEnabled

----                     --------------------------

****365.onmicrosoft.com                      False

Important Note

Be sure to disconnect the remote PowerShell session when you're finished. If you close the Windows PowerShell window without disconnecting the session, you could use up all the remote PowerShell sessions available to you, and you'll need to wait for the sessions to expire. To disconnect the remote PowerShell session, run the following command.

Remove-PSSession $Session