[LTI 1.3] Missing client_id on OIDC request body

Hi everyone!

I'm in the middle of setting up a PoC to integrate our external tool with moodle using LTI 1.3. I managed to configure a tool and receive requests from moodle into my app. But when receiving an OIDC login request, the request body  being sent by Moodle looks like this:

{

}

For some reason, the tool's client_id is not being sent in the request. Is this the expected behavior? Is there any way to configure my tool so it's sent along with the rest of the body parameters?

thanks in advance.