connection to exchange online from powershell is declining suddenly

Question

Hi,

We encountered a problem that we are not able to connect to exchange from powershell anymore, It's connects normally from another account so the problem isn't from machine, it in the account. It was fine before yesterday, Today I wake up suddenly to find this error:

New-PSSession : [ps.outlook.com] Connecting to remote server ps.outlook.com failed with the following error message :
Access is denied. For more information, see the about_Remote_Troubleshooting Help topic.
At line:1 char:12

• $Session = New-PSSession -ConfigurationName Microsoft.Exchange -Conne ...
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [New-PSSession], PSRemotin
  gTransportException
• FullyQualifiedErrorId : AccessDenied,PSSessionOpenFailed

I've tried many solution in the internet with no results: security defaults are disabled, Basic Auth enabled for all protocols.

I use this commands for connection:

$LiveCred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session

I Need Help Urgently Please.
Thanks in advance

Answer 1

Hi @Mark Villa ,
Are you still using the v1 version of the PowerShell module? When Basic auth for Exchange Online has been turned off, it would stop working. According to the error, it is an expected behavior.
Understanding the Different Versions of Exchange Online PowerShell Modules and Basic Auth - Microsoft Community Hub

It recommended that you could refer to the follow steps to use the latest v3 module to connect to Exchange online.

1. Refer to the link to upgrade Powershell to the latest version：Installing PowerShell on Windows - PowerShell | Microsoft Learn
2. Follow this link to update Exchange PowerShell module: About the Exchange Online PowerShell V2 module and V3 module | Microsoft Learn
3. After the update is complete, you can refer to the command link below to connect to Exchange online PowerShell : Connect-ExchangeOnline -UserPrincipalName navin@Company portal .onmicrosoft.com

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Answer 2

The method you are using is decade old by now, update your scripts. And make sure you are using modern auth, as legacy methods are now blocked. Using the V3 module will let you bypass all these issues: https://learn.microsoft.com/en-us/powershell/exchange/exchange-online-powershell-v2?view=exchange-ps#install-and-maintain-the-exchange-online-powershell-module