The client identifier (client_id) is missing or invalid.

[adoyle-h]

I'm using Proxy Provider with Forward Auth (domain level). And deploy the proxy container with docker compose.

services:
    authentik_proxy:
        image: ghcr.io/goauthentik/proxy
        ports:
            - 9000:9000
            - 9443:9443
        environment:
            AUTHENTIK_HOST: https://your-authentik.tld
            AUTHENTIK_INSECURE: "false"
            AUTHENTIK_TOKEN: token-generated-by-authentik

When open my website in browser, it redirects to Authentik and show "The client identifier (client_id) is missing or invalid.".

How to fix this issue?