My mouse can pair and scroll but when I click, it does nothing and makes no clicking sound as well. Only when I press really hard it will do something.

Test the mouse on another computer; if the button still responds only to unusually hard pressure and produces no normal click, the physical button mechanism is defective and the mouse should be repaired or replaced.^1^

Confirm the hardware fault

1. Check around the button for dirt or debris. Turn the mouse off first and remove only loose debris without forcing liquid into it. Microsoft recommends checking that dirt is not blocking mouse components.^2^
2. Connect or pair the mouse with another computer.
3. Test both buttons in several applications.
   • If the same button requires excessive pressure, the internal microswitch or button mechanism has likely failed.
   • Replace the mouse, or seek repair if it is under warranty. Continued hard pressing can worsen the damage.

As an additional Windows-side test, open Start → search for “Mouse settings” → Additional mouse options → Buttons, temporarily swap the primary and secondary buttons, and select Apply. If the physical button remains intermittent after its Windows function changes, that confirms the physical button is at fault.^1^

Only if it works normally on another computer

That result points to a Windows configuration or driver issue instead:

1. Open Settings → Windows Update → Check for updates and install available updates.
2. Search for and open Device Manager.
3. Expand Mice and other pointing devices.
4. Double-click the mouse, select Driver → Update Driver, and follow the prompts.^2^
5. For a USB receiver, unplug it for about 10 seconds and reconnect it directly to another USB port rather than through a hub.

Because pairing, pointer movement, and scrolling already work, re-pairing is unlikely to correct a button that has lost its normal mechanical click.

References

1. My left click usually not working - Microsoft Q&A
2. Mouse and keyboard problems in Windows | Microsoft Support