Nothing happens at "Press and hold"

[bukhalina]

Hi,

I just got two new buttons and cannot pair them with my Android phone.
I'm stuck at the screen which says I should press and hold the button and that connection should take no longer than 10 seconds.

I can press the button for 10 seconds, 1 second, 3 seconds, less than a second. The effect is the same: the button shows red pulsing light but nothing happens on the phone and the same screen persists.
There are no errors or anything, just nothing happens.

What do I do from here?

Thanks!

[bukhalina]

It seems a phone reboot helped.
Also, https://flic.io/support turns to have self-service troubleshooting which isn't bad.