laravelpassport socialite provider throwing GuzzleHttp RequestException cURL error 3

Laravel Framework version: 8.69.0

I have installed laravelpassport socialite provider following this documentation: https://socialiteproviders.com/Laravel-Passport/#installation-basic-usage

'/auth/passport-redirect' works fine. But it throws error on '/auth/passport-callback' GuzzleHttp\Exception\RequestException cURL error 3: (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for /oauth/token

[Note: I have successfully configured Google and Auth0 provider without any issues. But laravelpassport provider isn't working.]

Here is a screenshot of the Error screen: https://ibb.co/c2Y97HV

Here is my code: