Please ensure you are pressing the correct touch control area on the earphones. If the position is correct but the function still does not trigger, try using a different music app to test whether the function works properly.
When a gesture control is triggered, the command is sent from the earphones through the device to the app for processing. Some apps do not support track switch commands, so they will not respond to earphone control signals, disabling gesture controls.
This issue can occur with many TWS Bluetooth earphones on the market. Rest assured it doesn't indicate any fault with Ear (3).