I had a similar issue with a credit card after I moved some years ago. The problem was finally traced to some database that had a previous, previous address (that I hadn't lived at for about 10 years). Once I entered the old, invalid address, it worked. If you have a suite number, that can also cause this because the two systems that are being compared don't always store the street address in the same way. And you only get this resolved if you get a really good, persistent individual in customer support. Good luck!!
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