it keeps saying that that field is Required but it doesn’t offer any country to select
Thank you for your valued feedback. We are aware of this issue and our developers are working hard to fix it.
Take a look at the following TurboTax help article for an opportunity to register your email address and receive updates as they become available.
Why am I unable to enter a US billing address when trying to pay?
There is not a solution yet, but as AnnetteB6 said, you can register your email for updates in the link she posted.