I have a similar problem. I can file online however I cannot purchase returns without calling ProConnect in the US.

On the billing address the first dropdown box is "Other" (Choices are US, CA and Other) and the country is United Kingdom. The address is correct, only it will not allow a county that is outside of the US, and so my credit card payment fails.

This is pretty stupid as all they need to do is allow a text option for county when the country is marked Other. So far the operators at Intuit don't seem to be able to do anything about this so I would really appreciate it being fixed...or at least give us another way to pay. Has nobody at Intuit heard of PayPal and Apple Pay?