Zoom OAuth Integration

Hello,
I want to create a zoom meeting link for the users inside my app. Their is the zoom account of the enterprise type. So the flow is everytime the user confirms a particular person that user should be created . and for authentication i have used OAuth with zoom. So in order to get the authenticaion code it is redirecting me to the zoom sigin/signup page initially and its not allowing the users from the other account to sigin except the purchased account credentials. Can i know why i am getting redirected to the sigin/signup page. Should i switch to JWT for meeting creation or OAuth fits my requirement