Every other region except us-central1 returns an internal function error and stops the program from finishing the process.

exports.updateUserInCollection = functions
  .region(REGION)
  .https.onCall(async (data, context) => {
....

Why, I am not sure, if putting region to us-central1 or removing from function params, works.

Same is for local emulator, or firebase directly.

But I need to have a region.

Do you have any idea?