You have configured your corosync to use the internal ip addresses 172.24.129.85 (biomass) and 172.24.124.27 (pve02) but your machine "biomass" has the ip not configured. Thats why your corosync is not working.
Did you change the IP of "biomass"...
journalctl -b (upload as file here)
cat /etc/pve/corosync.conf on both nodes
pveversion -v
systemctl status corosync
cat /etc/network/interfaces
P.S.: Welcome to the Forum!
Mach Dir keine Sorge, wir alle hier im Forum haben irgendwann mal angefangen.
Den schwersten Schritt hast Du bereits geschafft, Du hast angefangen Dich mit Proxmox zu beschäftigen!
Es ist schwierig Dir zu helfen, wenn Du nicht an deine Maschine...
Nodes failing isnt the issue. the quorum device is meant as defense against a silo connectivity "tie". Anything short of a room losing connectivity would be handled normally without it.