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Again, try calling 611 (Customer Care), and select TROUBLESHOOTING. Some info that is missing here is what phone are you using, and is it a T-Mobile phone?
I think contacting our Care team is a good idea to get this issue resolved. Please reach out and let us know how things are going.
I have exactly the same issue, I am not able to log into my account in order to pay the bill and I receive this error message.