This is one issue causing 2 problems.
If you press “host a server” It will work the first time. If you disconnect you are unable to press host again.
If you exit the game, you will be unable to open it again on steam until you reboot, i don’t know what process is causing this.
Steam chat will also turn off/offline and you are unable to go online in steam chat until you restart. Sometimes restarting just the steam client isn’t enough.
Error massage:
Steam was unable to sync your files for Tower Unite Private Alpha with the Steam Cloud.
No network connection could be made to the steam servers. (steam chat goes offline, cant fix without reboot)