Hello,
You mentioned that you're using static IP with bridge mode.
Could you clarify how it is being used? Are you setting static IP, which address is router's WAN IP, on your devices network interfaces manually?
If you you're using DHCP on your laptop, is laptop able to get router's WAN IP automatically or you only able to get internet access using static IP?
For unifi USG device, make sure correct WAN MAC address is specify in RUTX09 mobile configuration window and you're not using LAN MAC accidentally.