So you seem to have something jamming the ports fr the Public Internet/WAN-side before connecting to WG Server on the Burme2.
What’s your phone OS? You’re going to need to do some port scanning & using a phone provides a GUI to do so if you’re not comfortable/able to SSH into one of the GL devices & run nmap.
opkg update; opkg install nmap
nmap -sU -p 51820 -v $publicIPAddressOfWANorModem
SSH’ing into the Burme2 or Beryl AX will also give the ability to get the output of wg show on ea. respective device. See the below resources: