Hi Leonardo, So two things were causing me problems.
one on calling the script in airtable. I needed to remove the redirect follow from the line bellow it seems apps script doesn't like that.
let response = await fetch(urlRequest, {method : “Get”, redirect : “follow”});
The second was the permissions on the script. Like you i was able to run the script via the browser. But I was logged in to my google domain and had the correct permissions. This was not the case for Airtable.
If you can't find a way to make it run nativley, Integromat isn't a bad solution and unless you are handling lots of data it's free.
Fingers crossed you find a solution.