Change the smtp address of a Microsoft 365 Group

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In order to create a remote powershell session to 365, open Windows Powershell and run below commands:

$UserCredential = Get-Credential

and enter your 365 credentials when prompted.
Then type:

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session -DisableNameChecking

To add required smtp address:

Set-UnifiedGroup -Identity "Group Name" -EmailAddresses: @{Add ="[email protected]"}

To promote as a primary smtp address:

Set-UnifiedGroup -Identity "Group Name" -PrimarySmtpAddress "[email protected]"

To remove the old address from the group:

Set-UnifiedGroup -Identity "Group Name" -EmailAddresses: @{Remove="[email protected]"

To end your Exchange Online Powershell session:

Remove-PSSession $Session
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