If one uses the search feature they’d see that folks with AT&T Uverse have problems with the My Cloud. The solution is to put a switch or hub inbetween the AT&T router and the My Cloud.
https://community.wd.com/t/cant-connect-my-cloud-using-att-uverse-1gig-fiber-service/140412
https://community.wd.com/t/cant-connect-to-u-verse-help/150157/2
https://community.wd.com/t/looking-for-help-with-my-cloud-and-2wire/95243
https://community.wd.com/t/router-connection-problem-with-mc/146230/2
https://community.wd.com/t/u-verse-connection-issues/144904/3
