Views:
Applies to Product - Dynamics 365 Project Operations

What’s happening?
Default system views are not visible to users, despite being set as enabled and published.

Reason:
The view had not been added to the model-driven app. 

Resolution:
The missing view was identified and added back to the app. 
Refer to Tutorial to add or edit model-driven app components with Power Apps - Power Apps | Microsoft Learn for more information.