WD Discovery can not find my My Cloud Home

Hi. I already have connected my My Cloud Home. I completed the installation software WD Discovery, but can not find the disk.

Have you went through the setup process at the link below? Once your user account has been created then you should be able to sign into your account in WD discovery.

www.mycloud.com

Now for something strange: MacOS Yosemite, no changes since yesterday, still Discovery thinks, my “My Cloud Home Duo” is offline. Logging in with the exact same account to mycloud.com, the device is accessable. Tried logging off in Discovery and logging in again - correct pw, but internal server error. Also using an iMac with High Sierra, no problems there, yet. Ideas or solutions? Thanks in advance.