My Cloud Not being recognized

Do you by chance use AT&T Uverse? If so, are you using one of their routers/gateways? If yes, then put a switch or hub in between the My Cloud and the Uverse router/gateway. There are others who have reported weird problems with AT&T Uverse router/gateways and the My Cloud. One such thread:

https://community.wd.com/t/cant-connect-my-cloud-using-att-uverse-1gig-fiber-service/140412