Hello @RobertS8714 ,
Looks like you're running into a Compliance-related element for contacts. Typically this occurs when a contact has unsubscribed and resubscribed to your account, but can occur for other Comp-related reasons. The only thing you can do in this instance is add the preferred email address as a "new" contact, and shift over the relevant contact info, list memberships, etc., then delete the current contact.
Also, please refrain from posting contacts' info on the Community for the sake of their privacy. If you need to submit contacts' info to us for troubleshooting or reference, please call general support for securer assistance.
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