When seeing an SOS panic it's always good to also state the number of slow red blinks between the two SOS signals - this will offer some hint for potential causes.
The video shows it's and SOS+10 (assertion failure)
https://docs.particle.io/tutorials/device-os/led/photon/#red-flash-sos
These are the more obscure kind of errors as they often indicate some branch in the device OS that wasn't actually meant to be executed.