Sudden 412 errors on same IP in supported region (working hours ago - now all failing)

model models/gemini-3.1-flash-image-preview
response: 412 User location is not supported for the API use.

Same VPS, Same IP, within supported region (Singapore)
working fine for months with multiple keys
now all keys failing for the past 4 hours

Can anyone advise on how to resolve this please?