Turn off your router and speakers. Leave them five mins.

Then turn the router back on and let it fully boot up, then do the same for each speaker, starting closest to your router and work out, letting each get to white light before moving to the next one.

Then see if the Trueplay toggle is there, or re-run Trueplay again.

I'd also reboot the controller's device at the same time just to cover all bases.

I have rebooted all devices , restant router etc, same issue

Trueplay doesn't remain in the app after process ( can't toggle on/off because there is no line)

I submitted diagnostic 

Moderator edit: Diagnostic number recorded and removed