While not as popular as other email clients, it is definitely useful in work environments. As a mail client, you need to work using contacts in your address lists. Unfortunately, users have been reporting on the official forums that they are encountering an error message when trying to add a new user mailbox. According to Microsoft:

How do I get rid of the name matching error in Outlook?

Make sure the user is not hidden from the address lists and that the user’s mailbox exists. Now that you’ve done that, it is time to test out whether this works: The account should now function normally without the error appearing anymore. Do you receive a name matching error in Outlook when trying to add new contacts? Are you currently aware of any other solutions we may have missed? If so, please do not hesitate to share with the other users in the comments section below.

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