Left-click doesn't work
Move the rest position of your fingers and then retry, clicking as shown in Fig 1. If you are still having a problem, lift your right finger slightly as you left-click.

Right-click doesn't work
When you want to right-click, you may need to first move your finger a little further to the right as shown in Fig. 2. The border between left- and right-click is not in the center of the mouse, but is shifted to the right. You may also need to lift your left finger slightly as you right-click.

If these suggestions don't appear to resolve your issue, please see answer 360023246594 for more help.
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