Error conecting to google API on N8N

Hello
I´m receiving an error when setting up a connection on n8n to my google sheets API.
The problem, as i ´ve digged it is that there is an OAuth Redirect URL misconfigured on my Docker
see: Connecting to Google on localhost - #6 by jtoh - Questions - n8n Community
My question is that I don´t know how to change the OAuth redirect URL or where to delete it.
When I edit app configuration I didn´t see any var like that
There is only an Additional Environment Variables which is not setted up at all
It´s empty
Do I have to first setup a variable like OAuth redirect URL with an empty value?

I have exact same problem but with Webflow integration. It points towards domain with port. I’ve been digging and trying to fix it for 2 days now.
The problem seems to be the way n8n app is packaged. it has variable N8N_PORT there with port inserted. I’ve been trying to remove it but unsuccessful. And to build a customApp in truenas for me seems like a nightmare. I will try to spin the VM and Im 99% percent positive it will work no problem.

I just fixed it!
But idk how it will affect the updating of the app.
I had to turn the app into custom app - only then I was able to see the yaml file and change the config.

Found N8N_PORT and deleted it - this action defaults to 5678 port.

then looked down for ingress option where i mapped the internal port to 5678.
Looks like this

ports:
- mode: ingress
protocol: tcp
published: 30109
target: 5678

But now I’m able to connect webflow integration.

I´m still facing issues when authenticating with Google via Oauth . It simple get a TIMEOUT in the last step, just after accepting all permissions