Don’t make an API call to this url. Just redirect user to this page “Open an external website” Action, and you will recive your code back in url, after granting scopes.
Or just coppy this link into your broswer.
Then you must make API cal to authorize with recived code:
you will recive this data:
Now you have access and refresh tokens and expiriation time, you can mke an API call that you want.
or refresh token if needed:
Hope this could help you