If you are unable to see your project and its associated hours in the Project Workload it is because you have not leveraged the Workload Sheet.
To do so, follow the below steps:
Go to your project.
Click on the drop down menu of the More button.
Select Workload sheet.
The Workload Sheet will appear:
Opening the Workload Sheet will trigger your project and its hours to be displayed in the Project Workload.
Choose from the menu Resources and Project Workload:
In the Project Workload you will see your project and its hours displayed: