[iOS] Conferences work on all devices except iPhone XS, XS Max, XR

The problem is only on these three devices - iPhone XS, XS Max, XR.
On all other physical devices (iPhone 5s, some devices on Android) on which I test - video conferences work fine.

After I go to the video conference screen, I immediately see that the conference terminated and see a black screen and this error:

Optional([AnyHashable(“url”): https://media.doctorsmart.ru/2383#config.startWithVideoMuted=false, AnyHashable(“error”): ])

And the most important - if I replace my Jitsi instance https://jitsi-prod.doctorsmart.ru with https://meet.jit.si, everything starts working normally on these iPhones (XS, XS Max, XR).

I understand that the problem is most likely on the my Jitsi server instance.
Please tell me what could be the problem.

Hi there!

Your URLs give me 404 errors.

Have you looked in the Apple store at the Jitsi app for 8x8 meetings?