Error connecting to Google Sheets API

i´m facing the same issue found on : Connecting to Google on localhost - #7 by Jon
But that thread is closed.
I´m On TrueNAS SCALe 24.10 and i have instaled n8n with default options
When I try to connect to authenticate with Google Sheet API throught Google Oauth i receive an error because there is a OAuth Redirect URL misconfigured.
Does anyone know how to setup that url properly?
Could someone help me?

you need to define the WEBHOOK_URL to a domain. This can be done in the docker-compose if you are using docker.
You could try setting it to 127.0.0.1.nip.io but this probably won’t work due to missing https.
another option would be to use something like tailscale to have a valid https and that is not accessible from the outside.

Thank you for your replay but in the thread i mention is the solution .
The solution is to modify or delete the webhook already present.
What I Don´t know is how to do it because I´m not into Dockers.
On my app configuration i can´t see any WEBHOOK_URL and I don´t know how to find the docker-compose.
As I said before i´m running my Docker on a TrueNAS Scale

Sorry, I don’t know how True NAS Scale uses and configures docker compose.
There should be an option to provide Environment variables.