Sonoff TH16 pairing

Dear recipient!

I have 2 Sonoff TH16 devices. Sonoff TH16 pairing.

As described on their website, I can’t restore and turn on the pairing.

It doesn’t matter how many seconds I press the button, it won’t start pairing.

It is only possible to switch physically by pressing the button on the devices.

How can I try differently?