Identify the job of the accessory
A Bluetooth keyboard, controller and headphones do different jobs even though they share a pairing menu. Decide what you need before connecting. Successful pairing proves an accessory was recognized; it does not establish every key, app control or audio feature.
Use the accessory manufacturer’s instructions to enter pairing mode. A button combination for another headset or keyboard is not a safe substitute. Charge the accessory, place it near Apple TV and make sure a previously paired device is not taking the connection.
Pair from Apple TV
Open Settings, Remotes and Devices, Bluetooth. Select the accessory when it appears and complete any code or PIN prompt. Apple shows a paired accessory under My Devices. Match the displayed identity with the product you are holding so a neighbouring device is not selected by accident.
Then perform one task appropriate to its role: type in a harmless search field, navigate a supported control screen or play a short spoken passage through the headphones. Keep service passwords out of the test wherever a simple search or local menu is enough.
Check the next session
Put the accessory away briefly, wake it again and repeat the same task. Reconnection is part of ordinary use and deserves its own check. A device that pairs once but immediately returns to a phone needs a connection-ownership investigation, not a different video source.
For intermittent loss, Apple recommends checking range, power, software and interference. Compare performance with the accessory closer to the box and with obvious obstructions removed. Record the physical change and result rather than treating all wireless problems as internet buffering.
Remove a stale pairing deliberately
Apple provides Forget this Device in the accessory’s Bluetooth entry. Use it when you intend to remove the saved relationship, then pair again using the accessory’s own instructions. Forgetting a device is different from merely stopping its current use.
Keep the original Apple TV remote available while evaluating another controller. This preserves a way back to system settings if the new accessory works in one app but cannot reach essential controls elsewhere. Compatibility remains specific to the accessory and the task.
Questions answered
Should I reset the whole Apple TV for one lost accessory?
Start with the documented accessory power, range, software and pairing checks before a device-wide reset.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.