Inconsistent "ResourceNotFoundException" Error When Updating User Attributes in AWS Cognito

I'm encountering an issue while updating user attributes in AWS Cognito. The problem is specific to the production environment and results in a "ResourceNotFoundException" error. I'm seeking insights from the community to help troubleshoot this inconsistency.

Problem:

When attempting to update user attributes in the production environment, I consistently receive the following error message:

"msg": {
  "message": "User pool us-east-2_******* does not exist.",
  "code": "ResourceNotFoundException",
  "time": "2023-08-09T11:32:50.538Z",
  "statusCode": 400
}

Observations:

• The code works flawlessly in both development and staging environments without any errors during attribute updates.

• Surprisingly, I connected my backend to the production database locally and tested the same code, resulting in successful attribute updates.

• However, using the same API request via Postman or in the production environment still triggers the "ResourceNotFoundException" error.

If you have encountered a similar issue or have insights into possible causes, your input would be greatly appreciated.