When you see an error saying "Failed to fetch" or get an ICE error this means that there is a connectivity issue between you and Lookback. Typically this is related to a firewall blocking your connection in some way. If you're connecting via a work network or VPN it's possible that your network administrator may be blocking certain ports that Lookback relies on for connectivity. We have several articles that go over trying to fix this both for those working from home and network administrators on.
If you're working from home and seeing this please review: Troubleshooting firewall issues when working from home.
If you're a network administrator or your users are encountering this error, please review: Troubleshooting firewall instructions for your IT team.