I was trying to get new access token in postman to access Twitter data through the Twitter API v2. I was following the procedures by entering the necessary information in the page as indicated below. I have also included the access token, the client id and client secret.
However, I am getting error messages as indicated in the following snapshot when trying to authorize through browser. I have also tried it with out the browser (using the postman app).

I have already obtained the following from the Twitter developer app: API Key, API Key Secret, Bearer token, Access token, Access token secret, Client ID, Client secret. The last two are for the Academic API use.
I appreciate your help!
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Were you able to solve the issue? I am stuck at exactly the same place.