The same trouble with same device has been here.
So, it’s Xiaomi trouble, and here is a solution for this problem:
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Go to the “Security” application and tap “Options” at top right corner
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Scroll down to “Feature Settings” group, and look for “Permissions”
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At there switch off “Install via USB” option, which manages installation of the apps via USB and doesn’t allow it.
On Latest Redmi Device
Settings > Additional Settings > Developer Options > Developer options: Check the Install via USB option.