Check the email address, and run the checks again. If you entered the correct email address, you need to either create a ...

Office 365

Check the email address, and  run the checks again.
If you entered the correct email address, you need to either create a mailbox for that user or create an external email address for the recipient.
In the Office 365 admin center, go to Active users.
Choose Add a user (Add icon).
Provide the requested information, and a mailbox is created automatically for the new user.

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