Unable to authenticate using OAuth

Previously we used to authenticate to our Forum Threads API using access key. Now we were asked to authenticate using OAuth. We have clientId, client secret and callback url.

Tried to authenticate in Postman with the above details by selecting Type under Authorization as OAuth 2.0, Grant Type as Authorization Code but it failed with error

"Error: Invalid protocol for auth URL. Only HTTP and HTTPS protocol are allowed."

Is there a way to get token without providing auth URL and AccessTokenUrl?

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