It seems that currently (2021-02-24 12:00) there is a problem with SoundJack.
My entry is now 381 instead of 321 and I have problems as if the port forwarding does not work too, but anything is correctly configured on my side.
After a reboot of all routers, switches and the SoundJack computer I don’t get any connected users on the stage, but the arrows and number of entries is displayed. Left column is present as well as the chat window.
Alex is informed, so we need to wait and check later if it works again.
I will put a note here as soon it works again on my side.