Hi @CA_BlueBoat / @Vincent -
I had intended to link to this thread in my reply - to summarize, download this lights.lua file and place it in your /configs/ardupilot-manager/firmware/scripts folder with the BlueOS File Browser (need to be in pirate mode for this.)
The latest version of the lights.lua file can also be found here.
Once you restart the autopilot (under Autopilot Firmware, or via the power button in the lower left of BlueoOS menu) you should have the light following the normal blink patterns.
If the issue persists, please verify you’ve loaded the default BlueBoat parameters via vehicle setup / config tab.