Getting No Sessions Found when player tries to select start grid

[Nelson Sandalwood 23]

Hi, So I am using the small ServerGrid example provided in the geri editor files.  Apart from changing the name and ID and removing the ship paths nothing has changed.  

The server shows up in the list of unofficial servers, but when selecting it it goes to the start grid select screen and says "NO Sessions Found" and refreshing the list makes no difference.

I have fully disabled the windows defender firewall in case that was a problem, and I am forwarding the ports properly,  and my router shows traffic on the ports.  

Any idea why it  it won't show starting grids?