Why isn't multiplayer working?

I was going to try and make a multiplayer game for the first time and I started to look example other people have made and nothing is working. I looked at the multiplayer game made by Gilles, the microverse and others and all they do is say error. I also tried it on my phone and it was doing the same thing so I don't think its a problem with my devices.

https://microstudio.dev/i/gilles/multinogame/

https://microstudio.dev/i/microstudio/microverse/

Does anybody have any idea what's going on? Thanks in advanced for any help!

As of now, I have been having the same issue, but It could just be the default MicroStudio relay servers are down at the moment.