False alarm and mystery solved.
I tore into the wiring for my Generator input plug and found that one of the wires was a little loose.
I tightened it down and everything is working perfectly.
Turns out the Cybertruck was probably detecting an issue and may have very well prevent my house from...
I have a setup just like the one in the video. (Interlock, Generator inlet plug, 50amp cord)
I have used it several times to power the house during blackouts over the last year without issue.
Lost power this morning and set it all up, but for some reason the truck keeps going into a fault...