A50+ with WD mycloud home

Hi,
I have installed 9 x A50+ Amp streamers with WD mycloud home. I have loaded all the music via PC but i cannot see the WD on My music. All 9 A50s are wired together with WD on a 24 port gigabit switch including Router.
Phone music and other streamings are available beside WD. I have also enabled PLEX and saved music also there but still nothing. When i use Fing app, i can see all ip address of 9 A50, WD, Router and mobile phone.
Any one who can help?

Benny