"Request failed" when trying to purchase premium land?

Posting here on the off chance anyone can help while I'm waiting to hear back from support. I've previously purchased the middle and right premium lands, and more recently purchased the 30 days of gems (around 10ish days ago). All these went through fine. However the past couple of days I've been trying to purchase the premium land on the left after "agreeing" and clicking "1-tap buy" I get an error message saying "Request failed: We couldn't complete your request. Please retry or try again later."

I've tried on different days and with different payment methods but no luck. The app is fully updated as far as I can tell and everything's fine with google pay... I'm in the UK if that makes any difference.

Any ideas?