Why can't the Redmi Note 14 Pro+ 5G control the TV or air conditioner using the infrared remote control feature?

A sensor and transmitter built into the Redmi Note 14 Pro+ 5G that allows the device to emit infrared (IR) signals to control electronic devices.
To solve the problem, please refer to the following methods:
1. The infrared sensor of the Redmi Note 14 Pro+ 5G is located above the flashlight. Ensure the back of the phone is pointed directly at the TV or air conditioner when controlling them;
2. Remove any case or obstruction that might be blocking the IR blaster's signal;
3. Make sure that your TV or air conditioner supports the IR blaster function, or they can't be controlled by the IR remote.