I have completed the verification process in the browser, but the gmail_token.json file was not downloaded.

[wwang129]

C:\Users\Administrator\AppData\Local\Programs\Python\Python39\lib\site-packages\oauth2client_helpers.py:255: UserWarning: Cannot access gmail_token.json: No such file or directory
warnings.warn(_MISSING_FILE_MESSAGE.format(filename))

Your browser has been opened to visit:

https://accounts.google.com/o/oauth2/auth?client_id=586800702615-5gvsc568q3j7ffq0hljkhba2qqssnvn0.apps.googleusercontent.com&redirect_uri=http%3A%2F%2Flocalhost%3A8080%2F&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fgmail.modify+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fgmail.settings.basic&access_type=offline&response_type=code&prompt=consent

If your browser is on a different machine then exit and re-run this
application with the command-line parameter

--noauth_local_webserver

[fingers53]

I am getting the same issue. I had this working before so not understanding why I am getting this problem now.

[fingers53]

I have fixed this issue. I had something else running on port 8080 on docker. That's why I got redirected