When connecting to Microsoft Teams or Skype Online ( https://docs.microsoft.com/en-us/office365/enterprise/powershell/manage-skype-for-business-online-with-office-365-powershell) you may experience the following error:
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Unable to discover PowerShell endpoint URI
At C:\Program Files\Common Files\Skype for Business Online\Modules\SkypeOnlineConnector\SkypeOnlineConnectorStartup.psm1:114 char:9
+ throw $resources.DiscoveringEndpointFail
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OperationStopped: (Unable to disco...ll endpoint URI:String) [], RuntimeException
+ FullyQualifiedErrorId : Unable to discover PowerShell endpoint URI
This occurs when your Office 365 Admin Account is not an onmicrosoft.com account. To resolve you need to specify the -OverrideAdminDomain switch on New-CsOnlineSession and specify your default O365 onmicrosoft domain. E.g:
Import-Module SkypeOnlineConnector
$session = New-CsOnlineSession -UserName "[email protected]" -OverrideAdminDomain "<MyTenant>.onmicrosoft.com"
Import-PSSession -Session $session

Technical Architect at Symity