Quite rightly, as Alberto mentioned this seems an issue specific to your account, which may involve reviewing configurations on your Project then it would be better evaluated by a GCP Support Engineer[1][2]. As indicated in this Doc[3], asia-northeast3 is a valid region and you should be able to create a Cloud Firestore in that region if you had not earlier set your default GCP resource location. I guess you may have earlier set your project's default GCP resource location(perhaps to asia-northeast2, which is probably why you are able to create the Firestore in that region) and then trying to set a different region hence, resulting in an error. Please note that once you have set your project's default GCP resource location, it cannot be changed[4].
[1]https://cloud.google.com/support-hub [2]https://developers.google.com/issue-tracker/#public_users [3]https://firebase.google.com/docs/firestore/locations#location-r [4]https://firebase.google.com/docs/firestore/locations#default-cloud-location -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/26b10532-5b21-4ead-a4d1-7c0812b24d53%40googlegroups.com.
