[Python] Generate SHA256 HMAC signature in Python

I'm trying to generate a SHA256 HMAC signature for a FTX websocket. I am using the params fromt he official example https://docs.ftx.com/#private-channels.

It should generate d10b5a67a1a941ae9463a60b285ae845cdeac1b11edc7da9977bef0228b96de9

but I am getting ad38fa3566de972abb736bc0db2f7cd39daa48b14421e168422303bf2f03c6de

here is what I tried:

import hmac
import hashlib
import base64

time = '1557246346499'
secret = 'Y2QTHI23f23f23jfjas23f23To0RfUwX3H42fvN-'


digest = hmac.new(bytes(time, 'UTF-8'),
bytes(secret, 'UTF-8'), hashlib.sha256)
signature = digest.hexdigest()
print(signature)

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