To fix Spotify login error code 409, you should clear the Spotify and browser cache, and then double-check and see if the login credentials you are using are correct.

If you get Spotify Error Code Auth 74 on Windows PC, allow Spotify in the Firewall, change the proxy settings - or follow the other solutions mentioned here.

1. Update Spotify Since the most common cause of the issue is an outdated app version, the first fix you should try is updating your Spotify to the latest version available.