VST Connect Pro setup sucks

An Issue in Cubase Pro 10:

When i connect to VST Connect with my “MxSteinberg” Account, it seems to work, but the green light, on the right side, want lighten up! I can see my partner (he also uses Cuabse 10 Pro) in the “Network / Friends list” with a blue light in front of his name, but if we want connect, an failure pops up: “Friend is running VST Connect. Connection is not possible”! Can anyone help us with this problem? Thank you

We just start to try this tool and don´t know really nothing about it!

My bro has to hear and see the actual project, in his cubase 10 pro. We want work togehter on that project. We just use Vst Plug ins and some Hardware synth. We don´t need to record voices or guitars from, not yet!