Problems with two NAS Medion NAS servers 2GB MD 86803 / WD MyCloud NAS Server 2GBund two TwonkyServer on Sony TV

[Lord Wotan]

I have two NAS servers in my network. Even longer a Medion NAS servers 2GB MD86803. And new WD MyCloud NAS Server 2GB.
When devices are working in network with my three PCs each Windows 10 pro without problems. Only on my TV Sony Bravia KDL-40CX520 only Medion NAS servers 2GB MD86803 is found. The WD MyCloud NAS Server 2GB emerged as not in menu. I can therefore only movies u. Music by Medion NAS servers 2GB MD86803 on my Sony TV streaming.
The Medion NAS uses TwonkyServer Premium Version 7.0.9-RC3, while the WD MYCoud Yes Version: 7.2.9-6 uses. How can I now also from WDMyCloud on my TV Sony Bravia KDL-40CX520 movies streaming?
On PC both NAS be found and I can stream data.
Finally, network router is a Fritzbox 7390th

Problems with two TwonkyServer? But how can I solve this?

From the Germans with Google Translate to English
Since I can not Englich