I had this same issue with PSE&G and was able to fix it. The issue was I was providing the zip code for my property. The box, however, says "biller's zip code", not the zip code associated to your account. Just google the zip code for the company and state you want add. For me, I googled "pse&g NJ zipcode" and entered the zip code that first came up, and was able to add my bill successfully.
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