Why can't I connect MyCloud to my Time Machine on Macbook Pro?

A few days ago, I noticed MyCloud didn’t do back-ups on my 2012 MacBook Pro anymore. It said that ‘MyCloud is unavailable or can’t be found’. The back-ups on my iPhone work well, and the MyCloud has a solid blue light (connected to router and all). I tried to solve the problem by removing the disk from my TimeMachine on MacBook (Was that a bad idea?) and now I can’t add it to my TimeMachine. Tried connecting to server (Command+K) already, didn’t work. What else can I try doing? Thanks!