Environment: Project Server 2010/2013
Solution: Use 1 of the 2 below options
Option 1 – Using Project Web App
Logon with User PM/Admin Credentials to Project Web App > Projects > Click on the Project Name > Click on the Schedule PDP > Click on Task Tab > Click on Edit > In Microsoft Project
Note: If you are not able to see the schedule EPT for a project then you need to contact your admin to configure it for that Project Type.
Option 2 – MS Project connected to Project Server
Directly via MS Project. Open the MS Project via connecting to the Project Web App. (Assuming PM has configured the Project Web App URL in MS Project in local machine).
FYI, Steps as below:
1. Launch the MS Project 2010/2013 then Click the File tab to open the backstage view > Click Info > Manage Accounts.
2. In the Project Server Accounts dialog box, click Add.
3. In the Account Properties dialog box, type a name for account in the Account Name box.
4. In the Project Server URL box, type the complete UAT server name (for example, https://ProjectServer/PWA).
5. To make this your default Project Server account, select the Set as default account check box.
6. To log on to the enterprise schedule via MS Project, close and restart MS Project.
Note: User should have edit rights to make changes in the schedule.
Hope this helps you. Thanks.