Alt keys not working on windows pc

[Dylan AGQ]

So this just started this morning when I tried to alt tab.. and the alt button just doesn't work. The tab button still works fine but alt doesn't work, I have a left alt button to the left of the spacebar and I also have a button called alt gr to the right of the spacebar, neither do anything though I'm not sure what alt gr is and if they're connected. I've tried reinstalling keyboard drivers, I've cleaned under the keys. I've used keyboard tester and it doesn't light up at all when I press either alt button. My keyboard is a bluetooth hp keyboard, I don't have a spare usb keyboard to test on

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