UBports CE pinephone, keyboard does not work

[Hook]

Hi Everyone

Today I got the keyboard delivered, but I cannot make it to work.

1. I see in many places to press the button on the keyboard (dis-attached from the phone), to turn it on/off, does it have any indicator light to show its status?
2. How to test if keyboard unit is working on it's own?

And I do not know if this is relevant, I'm an owner of a ubports CE version, but I installed PostmarketOS on it.

If you look on the order page foer the Keyboard in the store, it says:

PLEASE NOTE

• Not all mobile OSes support the keyboard case. At launch the keyboard is supported by: postmarketOS, Manjaro Linux, DanctNIX (Arch Linux) and Mobian.