The task was simple: Change the alias and the primary SMTP address of a Microsoft Teams team. This can be done by changing the alias and the SMTP address of the underlaying Office 365 group. But how? All you need is a PowerShell connection to Exchange Online.
All you need is a PowerShell on your local computer and Office 365 credentials with the necessary privileges.
First we need to provide the necessary credentials.
$cred = Get-Credential
A windows will come up and you must enter your Office365 credentials.
The next step is to create a PowerShell remote session with Exchange Online.
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $cred -Authentication Basic -AllowRedirection
Please note that basic auth will be disabled in October 2020!
To connect to this remote session, use Import-PSSession.
Import-PSSession $Session -DisableNameChecking
When you finished your work, make sure to remove the remote session with Remove-PSSession!