Why the RingCentral auth URL is redirecting to the 'login.ringcentral.com.au' by default?

Hi Team,

We used the RingCentral authentication API 'https://developers.ringcentral.com/guide/authentication/auth-code-flow' from our App and generated the authentication request as follow,

https://platform.ringcentral.com/restapi/oauth/authorize?client_id=<CLIENT_ID>&redirect_uri=<REDIRECT_URI>&response_type=code&state=<STATE_CODE>

But it is redirecting to the 'login.ringcentral.com.au' by default

the login URL is

https://login.ringcentral.com.au/?responseType=code&clientId=<CLIENT_ID>&brandId=5010&state=<STATE_CODE>&localeId=en_AU&endpointId=&session=3438664351329220668&display=page&prompt=login%20sso&scope=&appUrlScheme=<REDIRECT_URI>&ui_options=&code_challenge=&code_challenge_method=&hideNavigationBar=true#/enterCredential