The workaround worked. Although it still gave me the error, I was able to get the address back into the contact. I could not search for the email address - it returned no result, but got the error when I tried to add it to the contact. Ultimately, the user had to re-subscribe. I am all set now, and will use the workaround in the future. My apologies for showing my irritation. It's a frustrating problem.
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