Admin center doesn't load

I am a tenant admin. I doubt it would have shown the gateway I was not an admin of if I were not a tenant admin.

So I investigated in more detail.  Even after adding myself as an admin of that gateway, it did not show up in my power bi gateways list (in the power bi app site).  It looks like there is a viral commercial power platform tenant that was created some time in the past,  The problem is that we're a GCC (government community cloud) for office, and all of our power bi resources are (or are supposed to be) in the GCC tenant.  That will lead to several questions, most of them out of the scope of this thread. 

But there's one directly relevant question: How can I get the power platform admin portal to show me resources from GCC instead of commercial?