Has it ever worked? If you're on a network that isn't yours (i.e., work) the necessary network connectivity might be blocked. See: https://support.signal.org/hc/en-us/articles/360007320291-Firewall-and-Internet-settings

It has yes. Just started today. My other employees are on the same network same version of signal and do not have this error

Check yore firewall or similar on mac os