(Old-style) BT box remote control won't pair with Panasonic TV

[gsnowdon]

I'm trying to pair an old-style BT box remote control with my 90-year-old dad's new Panasonic HD TV, so he can control the volume on the TV from one control. But it won't work and I can't understand why.

I've followed the pairing instructions (see below), holding down the two buttons at the top and entering the Panasonic code (3846) - the remote appears to accept the code (flashing 3 times). I then press and hold down the TV on/off button as directed, and the light flashes intermittently, but the TV does not switch off as it is supposed to.

What might I be doing wrong? I have tried resetting the remote but that doesn't seem to have helped... any advice much appreciated!

[rbz5416]

Does this extra info from the online instructions help?

That seems to imply that it will cycling through some timing or other setting until it hits the right one.

[gsnowdon]

I should have said - have held the button down for well over a minute and still nothing happens

[rbz5416]

Odd question but does he have a soundbar by any chance? Reason I ask is I set up a Firestick for my neighbour recently & had very similar issues pairing his Panasonic TV to its remote. It only worked after I moved the soundbar well away from the TV's IR receiver. The Panasonic remote worked just fine but the Firestick remote wouldn't until moved the soundbar. I have absolutely no idea why though.

[gsnowdon]

No - I can't see anything obvious that might be interfering. The BT remote otherwise works fine controlling the box (and the Panasonic remote controls the TV fine as well)