Company members need to be within the authorized scope to be able to use the app. Members who are not within the authorized scope will not see the app in the Workspace.
Method 1: In the WeCom app, go to “Workspace” -> “Manage Company” -> “App Management”, select an app and modify the available scope.
Method 2: Log in to the admin console, and go to “App Management” -> “Apps”, select an app and modify the available scope.