I added Zendesk to cloud app security using the method below. I can see the app in "cloud app security" however when i click on the app, and then "activity Log" i only see one user accessing the app. This is a heavily used application, so im trying to understand why i only see one user ?
Check the user scoping of the CA policy in Azure AD. If the user/session doesn't match that policy to redirect to MDCA, then the users won't go there.
Summary: Make sure your policy scopes (users/groups, especially) are correct in both the Azure AD CA policies and the access/session policies in MDCA. If a user falls in one but not the other, they will not be monitored/blocked.