If you want to pair the Bluetooth device with your TCL TV, here is the instruction for your reference:
Press the settings
button on the remote.
Select Settings --> Remotes & Accessories --> Add Accessory.
Select the device name for pairing.
Note: If you pair the remote with the TV, please press the Home button and OK button together.
If the device is paired successfully, you could see the device listed on the menu. Here we paired the remote with the TV, and the remote is listed on the menu after pairing.