An invalid Peer error when using Telethon. How to fix?

Question

Python

Hello. I use the Telethon library to interact with the Telegram API.

The code:

receiver = InputPeerUser(user['id'], user['access_hash'])
await client(SendMessageRequest(receiver, message))

Exception:

An invalid Peer was used. Make sure to pass the right peer type and that the value is valid (for instance, bots cannot start conversations) (caused by SendMessageRequest)

Did according to the documentation:
https://docs.telethon.dev/en/latest/concepts/full-...