In some keyboards some key combinations don't work - it's a result of both the circuit layout and the code in the keyboard microcontroller. Plug in good quality USB keyboard and see if that works (if it does then it's just the keyboard can't cope) - or boot the Mac in Windows (using bootcamp, not an emulator) and if that works then it's the Mac OS itself.
Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!). https://deluxepixel.com
When I first bumped into this issue I remembered I had had a similar issue with a web game way back. Since it was a while back I wondered if keyboard manufacturers hadn't fixed this bizarre shortcoming. Obviously not.
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https://en.wikipedia.org/wiki/Rollover_(key)
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https://deluxepixel.com
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