Hello @STLRebels ,
There's likely a permissions or compliance-hold on that particular contact. You can do one of the following:
Add the new contact with the updated address as a wholly new contact, then delete the old one
Or, if you're wishing to keep engagement history:
Add the email you're attempting to change it to, using the Type or Paste Contacts option. Then, change the email address of the newly added contact to something random, such as test@test.com, but DO NOT delete it yet. Once this is done, you should be able to update the original contact with the newer address and THEN delete the newer contact you changed to have the junk email.
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