Define default email address domain for Office 365 Groups

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Microsoft Teams uses Office 365 Groups for Teams setup.
this also impact the "send Email to" feature of Teams and Modern Groups.

If your default tenant address is e.g. xyz.onmicrosoft.com and you wish to change it to your default Email domain, e.g. domain.com

Create a new EmailAddressPolicy in Exchange Online:

New-EmailAddressPolicy -Name Groups -IncludeUnifiedGroupRecipients -EnabledEmailAddressTemplates "SMTP:@domain.com" -Priority 1


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