Gmail API returns 403 error code and “Delegation denied for ”

Question

Gmail API fails for one domain when retrieving messages with this error:

com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 OK
{
  \"code         


        

Answer 1

I wanted to access the emails of fresh email id/account but what happened was, the recently created folder with '.credentials' containing a JSON was associated with the previous email id/account which I tried earlier. The access token and other parameters present in JSON are not associated with new email id/account. So, in order make it run you just have to delete the '.credentails' folder and run the program again. Now, the program opens the browser and asks you to give permissions.

To delete the folder containing files in python

import shutil
shutil.rmtree("path of the folder to be deleted")

you may add this at the end of the program