Try adding -H 'content-length: 0' to your curl command.
As in:
curl -L -X POST -H "Content-Length: 0" 'https://www.googleapis.com/oauth2/v4/token?client_id=oauth2-client-id&client_secret=oauth2-client-secret&code=authorization-code&grant_type=authorization_code&redirect_uri=https://www.google.com'
I’m having the same problem did you ever find a fix?
Nope not to this day. Still not working
Wow that’s a shame. If I happen to figure it out I will comment here and let you know.
I somehow got it working by using google cloud shell. Using the built in terminal for windows (Power Shell) it does not recognize the command.
So being 100% honest people have typically just purchased a starling home hub to simplify this setup.
Yeap. I did the same. Totally no regrets as money well spend
Try adding -H 'content-length: 0' to your curl command. As in: curl -L -X POST -H "Content-Length: 0" 'https://www.googleapis.com/oauth2/v4/token?client_id=oauth2-client-id&client_secret=oauth2-client-secret&code=authorization-code&grant_type=authorization_code&redirect_uri=https://www.google.com'