RS256 Token Validation & Decoding using Public Key Not Working "ValueError: Could not deserialize key data."

pyjwt.py

"""Solution for decoding and verifying Amazon Cognito (JWK) issued tokens.

- NodeJS (jwk-to-pem) to convert jwk to pem
- PyJWT to decode and verify an access token

- pm install jwk-to-pem
- pipenv install pyjwt
- pipenv install cryptography
"""

#node
jwk = require("./jwk.json")
topem = require("jwk-to-pem")
pem = topem(jwk)

# then write to file
fs = require("fs")
fs.writeFile("key.pem", pem)

# Return to Python
f = open('./appname.pem').read()

#Decode and Verify using pyjwt
jwt.decode(atoken, f, algorithms='RS256', verify=1)