If your AirPods are not entering pairing mode, several factors may be responsible. Firstly, ensure your AirPods are correctly positioned in the charging case, and the LED light on the front confirms that they are charging. If the LED light doesn't show up, charge the case battery. Also, verify that the Bluetooth on your device is enabled, and the AirPods are within range of the device. If possible, try resetting the AirPods by disconnecting them from all devices, putting them back in their case, holding the button on the back until the LED flashes, and then setting them up again. Additionally, make sure that your device’s software is up to date, and consider checking the internet for further assistance or contacting Apple Support.