I bumped into this Dilemma myself and without calling WD as it was 4am in the morning I managed to workout the confusing issue behind all of this and yet it is so simple, so here it is…YOU HAVE NOT YET OFFICIALLY CREATED AND LINKED THE DEVICE TO A MY CLOUD ACCOUNT! LOL.
As much as having your drive set up with your local home network which is currently visible by your network you need to now visit your drives online dashboard in order to create and link your device to a my cloud account via the cloud access tab within the dashboard itself.
This can be done via:
Using a computer that is connected to the same network as the My Cloud device, launch a web browser
Enter either the name or IP Address of the My Cloud device into the URL field of the web browser.
Important: If the My Cloud device name was changed, please use that name instead of ‘WDMyCloud’.
Once on your Dashboard, simply navigate to the cloud access tab on the top menu, click on your drive in the list on the left hand side pane and fill in the my cloud account section. You will then be emailed a validation link to whatever email you have provided where you then need to click on the link within this email link to sign in for the first time in order to validate your my cloud account officially and have your device officially linked to my cloud.
Once all the above has been covered then WALA, you can now sign in and view your device as visible on your my mycloud.com account when signing in as much as downloading and dealing with your drive via the WD Sync and App installer apps on your MAC or PC.
I hope this helps all of you and saves many hours and or days pulling your hairs out from intense frustration.
Your welcome and Best Regards,