Connected does not identify the audible source
Some headsets support simultaneous Bluetooth connections to two devices. That does not mean both media sources are mixed, or that the device with the visible video will always be the one heard. Sony documents source-switching and call behaviour for a supported multipoint headset. Check your exact headset's instructions; connection and priority rules are model-dependent.
List the devices currently connected to the headset, including a phone that may be nearby with its screen off. A player showing an active Bluetooth connection proves less than the complete listening route. If a ring tone or another programme becomes audible, preserve which device generated it before altering the video's selected soundtrack.
A hypothetical laptop and phone
Suppose a laptop's authorised lesson keeps advancing while the headset handles a phone event. The viewer later misses part of the lesson. Record whether the lesson paused, stayed silent or continued on another output. Do not assume the player knew the headset had switched attention or that it saved the missed position automatically.
For a controlled comparison, use the headset's documented source-selection method and a short sample. Avoid a real important call. Stop nonessential playback on the competing device through its own controls when the manual requires it. Do not unpair every device before establishing whether a normal supported source switch is sufficient.
Check the headset's current companion-app setting if the documented multipoint feature has an enable control. A remembered pairing list and two active connections are different states. The report should describe the active arrangement, not every device the headset has ever known.
Confirm the intended return route
After the phone event or competing playback ends, return to the intended source through the documented workflow. Confirm the correct programme sound and playback position. If automatic return is expected by the headset's manual but does not occur, report that exact transition with both device models and software versions.
The useful conclusion is a verified listening route for the actual two-device arrangement. It is not a claim that the video source lost its audio, that all multipoint headsets behave alike or that a new subscription will resolve the source switch. Keep headset priority and programme delivery as separate questions.
Questions answered
Can both devices show connected while I hear only one?
Yes, supported multipoint arrangements can maintain two connections while source selection follows the headset's documented rules.
Should I immediately unpair the headset to recover the lesson?
First identify the competing source and use the supported switching method. Preserve the current state before a broader reset.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.