I just installed the latest openHABian, 32 bit flavor, on a raspberry PI 3.
I had no issue and have been able to setup a signal linked account, first try.
Is there something about the PI 4 ?
Or could it be related to this issue ?
(I see, @Wolfgang_S , that you participate to this discussion).
You could maybe try the same approach to check the library extracted (with the ‘file’ command)