Customize SCOPE/ Get users with custom API problems

Hello , Im blocked and I need your help please , I have 2 problems .
1- How to change scope in a costum api from “openid profile email” to a costum scope
2-I implemented a custom api and i wanted to get list of users ‘get’(api/v2/users) , the audience is correct and present in the access token but the response is always ‘400 bad audience’ , when i changed the audience of the custom api by the audience of the ‘Auth0 Managment API’ the response is ‘403 Insufficient scope’ because of the 1st problem the scope contains only “openid profile email”

I WANT TO USE MY COSTUM API SO HOW CAN I RESOLVE AUDIENCE PROBLEM AND CHANGE THE SCOPE !!
THANK YOU