Unable to checkout purchase

When clicking the "continue" button on the address page when checking out a purchase, the button shows a spinner for a moment, and then nothing happens.

Checking the network request in the browser, here is part of the GraphQL response:

{

"category": "graphql-input",

"exception":

{

"message": "A region_id is required for the specified country code",

"path":

[

"magento2",

"createCustomerAddress"

]

}

}

The country I'm selecting is Australia.

Issue happens on desktop and mobile. Multiple browsers.

I hope this can be fixed soon. I'm tryin to buy Kontakt half price before the sale ends lol.

Anyone else having this issue?