Gateway Group with VPNs stay Pending

[Jalau]

Hey guys,
I setup 3 different VPN connections and I am trying to create a gateway group so I can have a fallback routine in place if one of them failes. I can just select their interfaces manually in the firewall rule which works and routes all my traffic through the selected VPN however this does not allow for a fallback mechanism. Now sadly for some reason in the gateway group all 3 VPNs are greyed out and say "Pending". If I select the Gateway group for a firewall rule it will just use my normal IP/connection for some reason even though I added no fallback to my normal IP/connection to the group. I am running version OPNsense 19.7.5-amd64. I restarted the server like 20 times already, no success.

Thanks for any help in advance.

[Jalau]

Solved. Had to add monitoring IPs to the gateways.
Still wondering though why they are required even though the VPNs as a single gateway worked fine in the firewall.