Yes, the global server went down soon after the Microsoft-hosted servers were closed.
There are a few versions of the "Global server workaround" patch available on the net, but you don't need any of them (Actually, some of them are know to cause false positives with Disco anticheat) as Discovery has its own version of the workaround tool included with the installation. You just have to select either lan or internet games, then wait for the list to load. It may sometimes take a second or two which is normal, but if it doesn't show up at all, your best bet would be checking your firewall/antivirus settings to make sure internet access for freelancer-related tasks are not blocked.