Can't stream to Surface Pro 6

[blastoff 0]

I have no problems streaming to my Ipad but I cannot stream  to my Surface Pro 6. No matter what I  try Emby Theatre will not recognize my server.  Any help would be greatly appreciated.

 

I'm running Windows 10 on a fast Dell Computer.

 

Thanks!

[WilhelmStroker 102]

Is this the store app or the downloaded one? Fwiw emby works without issues on my Surface Pro 4.