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Exchnage Email Address Policies in Exchange Online
In Exchange on prem we can set an Email Address Policy to create email aliases for new users to include email addresses using various and multiple name and domain combinations by default. Is this po...
Email Address policies are available in Exchange Online, but you can only use them against Modern Group object, so they are pretty useless. PowerShell scripts are the usual workaround.
Please review the link below
Assign an address book policy to users in Exchange Online
https://docs.microsoft.com/en-us/Exchange/address-books/address-book-policies/assign-an-address-book-policy-to-mail-users