Alt/Option Key Not Working

Hi! I have kind of a unique problem, so I don't know where to ask for help...

They key issue is that I can't get the Alt/Option key to work in-game to place objects without them snapping to the grid.

A bit of a long backstory (I'll try to keep it short) to explain my current issue:

I sometimes play using an iPad (Luna Display makes the iPad function as an external monitor and then I use my iMac's keyboard and mouse) and it works just fine. I do that on weeknights most of the time when I'd rather sit on the couch instead of at a desk (since I was working at one for 8 hours already). This set up works, but it's a bit cumbersome having three items out there, trying to balance the iPad on its crappy SmartCover stand, keyboard on my lap, etc. So I bought a Brydge keyboard to solve that problem! The iPad slides into the Brydge and it basically looks like a laptop. Now my iPad stays upright and the keyboard is attached and sturdy. It's the perfect solution! EXCEPT, the Sims isn't recognizing the Alt/Option key on the Brydge keyboard. I tried SHIFT+OPTION (thinking maybe I needed to modify the Option key to make it Alt). No matter what I try, I can't place items off-grid.

I tested the Alt/Option key outside of the Sims game to see if maybe the key itself was broken, but outside of the Sims, it works fine.

I know it's a weird and unique problem, but does anyone have any ideas I could try? (@Bluebellflora, I know you're the resident Sims for Mac expert if you have any ideas?)