I have the same problem. Even PayPal fails with the same error. The VISA transactions are actually going through to the bank. So I have a dozen pending transactions on my credit card website. AMEX fails as well. I spent 30 minutes on the phone with USPS tech support, they couldn't figure it out and said someone would call me back. I don't see many articles about this online so I suspect there aren't too many people having this issue. Tech support hadn't heard of it. Therefore, I'm thinking there is a problem with they way USPS is matching our billing address with that of our credit card companies (and PayPal). I triple checked that they matched, I changed a few things so they were exact but still no go. I've used USPS for years, and I've always had intermittent problems like this. However, this is the first time payments have gone through to the bank but I never actually get shipping labels. If I figure it out I'll post here since this is the only place I can find on the web discussing it.
I have the same problem. Even PayPal fails with the same error. The VISA transactions are actually going through to the bank. So I have a dozen pending transactions on my credit card website. AMEX fails as well. I spent 30 minutes on the phone with USPS tech support, they couldn't figure it out and said someone would call me back. I don't see many articles about this online so I suspect there aren't too many people having this issue. Tech support hadn't heard of it. Therefore, I'm thinking there is a problem with they way USPS is matching our billing address with that of our credit card companies (and PayPal). I triple checked that they matched, I changed a few things so they were exact but still no go. I've used USPS for years, and I've always had intermittent problems like this. However, this is the first time payments have gone through to the bank but I never actually get shipping labels. If I figure it out I'll post here since this is the only place I can find on the web discussing it.