Problem with using NextDNS and DYN streaming App

I was setting up NextDNS on our System and IT works quite well. 

One exception I could not solve up to now ist, that streaming via "DYN-App" (Magenta TV) is not working. App ist starting at Receiver, but Live program of stream is not running. 

I could at the end not recognize any block in the protocol, but it still doesn't work.

Can anyone describe Solution to Set Up "DYN streaming" with using NextDNS? 

Thank you.