We've been having a lot of different synergy issues in cloudrest lately. From the balcony synergy not being able to be used, the hoarfrost synergy bug, (which has been around for years), and now apparently the "can't synergize the portal" bug. There's literally nothing that you can do as a player in these instances, and it can and has, wiped a pull through no fault of our own.
https://youtu.be/8I_5RiKGP6w