{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "invalid",
    "message": "INSUFFICIENT_PERMISSION"
   }
  ],
  "code": 400,
  "message": "INSUFFICIENT_PERMISSION"
 }
}

https://www.googleapis.com/identitytoolkit/v3/relyingparty/getAccountInfo

{
  "emailId": 'test@example.com'
}

{
  "error": {
    "status": "INVALID_ARGUMENT",
    "message": "The API Key and the authentication credential are from different projects.",
    "code": 400,
    "errors": [
      {
        "reason": "badRequest",
        "message": "The API Key and the authentication credential are from different projects.",
        "domain": "global"
      }
    ]
  }
}