Remote Play Together Not working

[HandOfAndy]

Hello all!
I struggle to use Remote Play together with Chipmonk!.
I use a Windows PC while the other player uses a Mac.
Neither from PC streaming to Mac nor from Mac streaming to PC Remote Play works.
Often Remote Play just crashes. In the rare case a connection can be established, one can only hear sound. Instead of the streamed video, one can only see "Host unavailable.

Do you guys have any suggestions?