Unable to build team from enterprise from a master project?

Hi again, 

I'm trying to Build Team from Enterprise in a master project, but it is greyed out. I can build the team in each of the subprojects as the option is not greyed out there, but for ease I would like to be able to do this in the master project.

In the screenshow below, it shows that I must be connected to Project Web App to use this command. In the next screenshot, if I hover over the Enterprise Resource Pool, it says the same thing but it's not greyed out.

Is it because it's a master project, or is there something wrong with my account?