I am running a Wireguard server and trying to connect to the server using my iPhone. The Wireguard app on the iPhone works great when I am connected to the internet using 4g or the ISP stock WiFi. When I connect to the Deco Wi-Fi, the internet drops, and the Wireguard app logs: "Failed to perform handshake" continuously.

My mesh Wi-Fi uses 7 Decos, and it is on AP mode (still using the ISP modem + router). The Decos are all with green light, and other devices in the network (without wireguard) don't have an issue connecting to the internet. I only have Apple devices to triage with (Laptop + phones) 

I've performed the basic troubleshooting suggested: https://community.tp-link.com/en/home/kb/detail/412688 plus rebooted my Deco network a few times to no avail.

Please help me to resolve this issue.