You’re welcome! Postman validates that the API and credentials are correct. The NetSuite error is a different thing. It’s rejecting the interactive login from Make.com using OAuth consent.
Try logging out of NetSuite and logging in at the same URL shown in the OAuth window.
When logging in and it still returns as “Invalid login attempt” then you can check the Login audit trail. You’ll see the specific reason.
When logging in and it succeeds, then all you need to do is to re-try the OAuth connection.
I’ll wait for your reply!