Try booting into Safe Mode (hold Shift while restarting). If scrolling works there, a third-party app is blocking it. Common offenders: BetterTouchTool, USB overdrive, or Logitech options.
Go to System Settings > Accessibility > Pointer Control > Mouse Options . Ensure the "Scrolling speed" slider is not set all the way to the left, which effectively disables scrolling. apple magic mouse not scrolling
Often, a simple "reboot" of the device's connection resolves unresponsive scrolling. Try booting into Safe Mode (hold Shift while restarting)
Sometimes, the issue is simply a configuration setting that has been toggled off. Go to System Settings > Accessibility > Pointer
Users and reviewers frequently highlight several reasons why scrolling fails:
If you have cleaned the mouse, checked the settings, and re-paired the device but scrolling still does not work, the issue may be a hardware failure of the touch sensors. If the mouse is still under warranty or covered by AppleCare, contacting Apple Support for a replacement is the recommended next step.
Pair the Magic Mouse with a different Mac or iPad. If scrolling still fails, the hardware may be faulty. Contact Apple Support.