Prime charge cable wouldn't charge other J1772 EV?

Tried to use my Prime cable to charge a friends Mach E that was visiting. Kept blinking on and off. Didn't seem to like the Ford

Still works fine on mine, just thought I could give a friend some juice over night. Didn't see any threads specifically discussing this, but curious if anyone else has come across it. I assumed a standard J1772 should charge anything that takes that same receptacle. This was off 120V needless to say...

Thanks for any thoughts on if this is standard, and if best to let sleeping dogs lie or if it's the sort of thing one can make a calculated decision to somehow over-ride (like using extension cord or using standard plug on 220V with adapter).