How to add a new a alias to an existing Office 365 group

Some time ago I worked with an organization that had difficulties in receiving emails on a newly added address. The Organization used “Set-UnifiedGroup” cmdlet to successfully add a new alias to an existing Office 365 group, but external senders were receiving the following NDR: “550 5.4.1 [newaddress@contoso.com]: Recipient address rejected: Access denied” upon sending an email…

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