getting this error after clicking get new token while connecting postman during a challange

Hi @CHAITANY POTEKAR This error (OAUTH_APPROVAL_ERROR_GENERIC) usually occurs when Salesforce cannot complete the OAuth authentication request from Postman.

I would suggest checking these points:

1. Client ID: Verify the Consumer Key in your Postman OAuth settings.
2. Callback URL: Make sure it exactly matches the URL configured in Salesforce.
3. OAuth Scopes: Check whether the required API permissions are enabled.
4. Connected App: Verify that your user has permission to access the app.
5. Login URL: Use the correct Salesforce login URL for your Playground.
6. Postman Collection: If you're using the Salesforce collection, check that its Client ID is correct.

Start by checking the Client ID and Callback URL. Also, review Salesforce Login History for more details. Once corrected, try generating a new access token. 

Related Official Documentation:

• Connect Postman to Salesforce – Trailhead
• Salesforce Platform APIs – Postman
• Postman OAuth 2.0 Guide

Hope this helps!