As almost no one seems to use Mumble due to installation issues, I have created a Discord channel as an alternative.
If you go to discord.com and create an account if you don't already have one (the free option is good enough), you can follow the invitaion link below to join the EHM Company Channel Discord server.
Disclaimer: As I am very new to this myself, I might not be able to provide support if you are experiencing problems.
Use the below link to join the channel. You should only need to join once; the channel will be in your list of memberships the next time you log in to Discord.
https://discord.gg/CFA3z4wJaU