That should be an easy fix, @rmjuarez12. You need to double-check that the redirect URL entered for your OAuth App matches the redirect URL used when making the Authorization request.
Redirect URL for OAuth
https://marketplace.zoom.us/docs/guides/build/oauth-app/#redirect-url-for-oauth
Step 1: Request user authorization
https://marketplace.zoom.us/docs/guides/auth/oauth/#step-1-request-user-authorization
