Oauth app no longer working

[elisa.zoom (Elisa)]

Hi @massimo.tarquini
Thanks for reaching out to the Zoom Developer Forum and welcome to our community!
I am sorry to hear that you are having issues getting an access token using your Oauth app.
I have a couple of questions about this issue, what kind of app are you working with?
An Oauth app or a Server to Server OAuth app?
If it is an OAuth app, is this an admin-level or a user-level app? and lastly if it’s an OAuth, do you intend to publish the app?

Also, feel free to reference this helpful guide on how to use the OAuth app type with Postman

Guide: Making a Zoom API Call with OAuth Credentials in Postman

To publish an app on the Zoom Marketplace you must create an OAuth app. When you’re ready to test making API calls, download the latest version of Postman and import the Zoom API collections following the steps outlined here. There are Three Ways to Set up OAuth in Postman to Make API Requests We’re going to go through three ways to set up our OAuth application credentials to successfully authorize and access the Zoom API to make requests. The “Easy” Difficulty OAuth 2.0 Set Up in Postman W…

I will also send you a private message to request more details about your issue, but in the meantime feel free to check that guide
Cheers,
Elisa