- Verify the correct spelling and format of the email address
- Check if there are any existing conflicts with an already existing user (such as an email address with the same username, or a username with the same name as an existing email address)
- Check for any group policies in place that may be blocking the ability to change the email address
- If possible, check other user properties such as phone number or departmental properties to ensure they are up to date
- Ensure that the user has the correct permissions to edit their own email address