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Base on your thread, I would like to introduce the feature of proxy address (alias) to you. You can configure more than one email address for the same mailbox. The additional addresses are called proxy addresses. A proxy address lets a user receive email that’s sent to a different email address. For detailed information, please click on the link below.
Reference: How to log into the Exchange admin center (EAC) in Office 365 for small business.
Have you any updates on this issue? Please feel free to let me know.