Can't get any user meeting details

hey, i was creating a “zoom app” type app in which i was using api to get user details from user/{email}/meetings, with access token generated form my other app which is a server to server oauth app using client Id and client secret.
But it is giving only my own user details , i tried with other email id but then also it is giving my own user details.
i need if i enter other email id i get its user id and from that i can access all live meeting for that user
Any idea how to fetch correct details.

thanks & Regards