Getting the HTML page in return instead of the code while authorization.

I am trying to get the authorization code from postman.
These are the params I have given:

client_id:d50c*****-40d7-**********a9bd6
response_type:code
redirect_uri:https://oauth.pstmn.io/v1/callback
state:fdf80155

When I am making a GET and POST tried call to

I am getting 200 OK and a HTML page.

I am not getting the code for token generation.

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