Unable to add email address due to existing account on iPhone 16 Pro

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Unable to add email address due to existing account on iPhone 16 Pro

An identical exchange account already exists. I am not being allowed to add an email address. It has never existed on the subject iPhone 16 pro so there is no duplicate. None of the answers address this problem. There is nothing for me to delete on the phone. HELP

[Re-Titled by Moderator]

Original Title: Iphone

iPhone 16 Pro, iOS 18

Posted on Aug 27, 2025 08:00 AM

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Answer 1

Aug 27, 2025 08:11 AM in response to JanFar007

Given Microsoft Exchange Server mail is usually a business function, check with the IT group, or with Microsoft support.

Also check potentially-related Microsoft documentation:

https://learn.microsoft.com/en-us/troubleshoot/microsoft-365/authentication/office-365-user-with-name-already-exists

This for the Microsoft error A user with this name already exists. Use a different name.

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