Time Machine doesn't work on My Book Live via Wifi

My Time Machine recognises my MBL straight off the bat if my Macbook is connected the ethernet cable. However when on wifi, it simply doesn’t recognise its presence. 

The weird thing is that I can do a direct connection and do a file drop.

Please… anyone out there having the same problem? I’m lost…

Can you give us more information of your network setup?

I’m not really good in the technical stuff. What kinda information will you require?

I can try accessing the router to pull them out.