Well, we found a solution. And it went really well - 6 players were involved, each at home. I had the game and a camera setup to put the image on the internet - and then deliver it to everyone at home with Microsoft Teams. Then headsets and off we went, explaining the game, playing, talking about it together - all of this is also possible during times of social distancing.
I already had the camera tripod, the small swivel arm with phone holder costs 35€ and the phone - you often already have something like that. Then on the phone a small app - "IP Webcam" - with which the phone's camera is accessible via a website. And on the notebook Teams, with which I shared the browser window with all participants. And off we go!