Everytime I try to install it I get a message saying error app could not be installed
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While I don't have the exact device, I can't reproduce the problem on Android 11. Tried both virtual and physical devices, and there are no problems. The only idea I have is to clean up the cache, re-download the apk file and try again. But it's more of a wild guess...
Sorry, if this won't work, I have no idea what's wrong in your case. In theory, Android studio logger can give us something, but sending your device to me and back is a bit overboard.