Element Fdroid cant do calls

Hi,

I installed Element (1.0.0) from Fdroid. Everything seems to work except proper calling. I can engage the call button, and it starts some calling window but the other side never rings, and I do not get any ringing at all. It seem like this is some kind of bogus call, although this creates some activity with my Coturn (only when I drop the call by pressing the red phone button on the screen) which I setup in Synapse (Debian) setting file.

It feels like it never engages with the server or the other side fully.

I also have Riot (Fdroid) on the phone and this one has no problem calling my users, in fact I have been using it for couple years for callling.

Synapse/1.17.0
Debian Testing
Coturn 4.5.1.3-1
Element 1.0.0
Android 9