Some letters on keyboard for my iMac are not working?
The letter o and I have stopped working on my wireless keyboard for my iMac can this be fixed?
iMac 21.5″ 4K, macOS 11.5
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Try the following: Reset NVRAM or PRAM on your Mac - Apple Support
Also turn the keyboard off and on a couple of times.
If it still doesn't work correctly log into a basic admin user account, Set up users, guests, and groups on Mac, and see if the problem persists. This tells us if the problem is limited to your user account or is system wide.
Next, boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. This will tell us if the problem is caused by some 3rd party software. Reboot normally and test again.
If still not working pair the keyboard with another computer and test. This will point the finger back at the keyboard if the problem persists.