OAuth 2.0 web authentication

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My question:
I am using OAuth 2.0 authentication yet it seems like I cannot get the access token in response.
I followed the steps to create OAuth 2.0 authentication.
What am I doing wrong?

Details (like screenshots):

How I found the problem:

I’ve already tried:

I’d like to share some resources with you : https://learning.postman.com/docs/sending-requests/authorization/#oauth-20

In the 30 days of postman collection day 14 goes through all the various steps to get started with OAuth 2.0 : Postman

One thing to keep in mind here is to set the Callback url to https://oauth.pstmn.io/v1/browser-callback

Callback URL: The client application callback URL redirected to after auth, and that should be registered with the API provider. If not provided, Postman will use a default empty URL and attempt to extract the code or access token from it. If this doesn’t work for your API, you can use the following URL: https://oauth.pstmn.io/v1/browser-callback

Screen Shot 2022-04-21 at 11.47.03 AM

if you take a look at day 14’s example I am sure you will be able to replicate on your end.