I am trying to play with my kids on their Nintendo Switches and I am on PC.  Was working great until pc got this update... Now I cannot join them and vice versa I was able to share our save with my son on his Nintendo Switch so they can play for now but every they or I try to join each other it no longer works.  Side note, the Nintendo Switch versions did not receive this patch update yet and could pose the problem.

Hello!

There was a delay with the Nintendo Switch patch, but it should be available now. I recommend downloading the patch and trying again. If that doesn't work, please feel free to submit a support ticket and we'll look into it. 

Obsidian Support

Thanks, and have a great day!