Assistance Needed with InvalidKeyError in Retool Python Integration

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i've tried different approach to authenticate but it seems the error comes from a bug on retool side, as the same code works fine on jupyter notebook but not on retool workflow i ve managed to drill down the problem into this code below: even though it doesnt authenticate, it shoots back the error : InvalidKeyError: Could not parse the provided public key.

any help would be greatly appreciated thanks

import json
import math
import secrets
import time
from hashlib import sha256

import jwt

class FireblocksRequestHandler(object):
    def __init__(self, private_key, api_key):
        self.private_key = private_key
        self.api_key = api_key

    def _sign_jwt(self, path, body_json=""):
        timestamp = time.time()
        nonce = secrets.randbits(63)
        timestamp_secs = math.floor(timestamp)
        path = path.replace("[", "%5B")
        path = path.replace("]", "%5D")
        token = {
            "uri": path,
            "nonce": nonce,
            "iat": timestamp_secs,
            "exp": timestamp_secs + 55,
            "sub": self.api_key,
            "bodyHash": sha256(json.dumps(body_json).encode("utf-8")).hexdigest()
        }
        return jwt.encode(token, key=self.private_key, algorithm="RS256")


    def get_request(self, path):
        token = self._sign_jwt(path)
        print(self.api_key)

        headers = {
            "X-API-Key": self.api_key,
            "Authorization": f"Bearer {token}"
        }
        print(headers)
        return headers


base_url = 'https://api.fireblocks.io' 
request_handler = FireblocksRequestHandler(FIREBLOCKS_API_SECRET, FIREBLOCKS_API_KEY)
response = request_handler.get_request('/v1/vault/accounts_paged')
return response