Google Drive Error: Registered app required, either through authentication token or key param

Question

Suddenly today requests from my service attempting to insert a file into Google drive via the Drive API started to receive a 400 error. The error indicates that a registered app is required, full error below. An application was already registered in my Google Cloud console, however the applications name did not match the application name that was used by my service. I renamed the services application name, however the error continues.

400 Bad Request
{
  "code": 400,
  "errors": [
    {
      "domain": "global",
      "message": "Registered app required, either through authentication token or key param.",
      "reason": "required"
    }
  ],
  "message": "Registered app required, either through authentication token or key param."
}

Is there something else that needs to be setup, or could this be a delay in the renaming of the service?

EDIT: I'm able to list, update and download files however I cannot insert.

Answer 1

This same issue just started to happen to us today - and we made no changes. I (think I) submitted a bug report to Google about this. Will keep digging..

UPDATE: I created a new project with private key and client ID/email and I get the same error with this new project as well. This appears to be some bug with Google Drive API service.