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).

 

Yes, their OEM charger works. My OEM charger works. But my Toyota OEM charger did not work on his Ford.

Light was blinking and it would click... never seen it do that before (normally clicks once when I plug it into mine, but this was repeating like a boot loop).

I don't see any reason why it shouldn't charge... after all, that's the idea of a standardized plug. But I seem to have run against OEMs not playing nice in the sandbox (perhaps to avoid liability possibilities).