CloudKit Console: JSON Web Token Validator shows Unrecognizable claims found (Token Generated with Python)

Hello guys I am getting this error Unrecognizable claims found when trying to validate my JWT Token for push notifications.

I don't understand what it means. Can someone tell me how to resolve this issue?

I am using python, and using the time module to generate the epoch. I guess, this is where the issue is coming from, but I am not sure.

import time
epoch = time.time()

Thanks in advance.