Zoom Error code 100056000 on Chromebook zoom extension

Hey @Principles, first try to go to settings > network > click on the wifi network you're connected to > click on the wifi network you're connected to again from the list of networks available > click on "proxy" section > enable "allow proxies for shared network". 

Secondly, ensure you're not using a VPN. If it works without the VPN but not with it enabled then I would recommend making sure that the following IP/ports are accessible while using the VPN: https://support.zoom.us/hc/en-us/articles/201362683-Network-Firewall-or-Proxy-Server-Settings-for-Zoom. 

Try the following above and let me know if that helps!