LMS 7.7.2 QNAP und DLNA

Dear all,

I got LMS 7.7.2 on a QNAP NAS runnig. Connected are two SB Radio and one SB Touch, which works excellent.
Not I'd like to use listen to music I got on my Smartphone - using DLNA.
The problem I am facing right now: None of the APPs I am using is showing any SB devices as DLNA client.
On the NAS there are no other services running which are using DLNA - so the ports are free for LMS.

I hope, anyone got an idea, what's going wrong.

Best regards,
El Cattivo