Important: I can't find the 9-digit Activation Code on my product

My Cloud OS 3 Personal & Network Attached Storage My Cloud
2

From WD KBA20384 …

There is no 9 digit code for My Cloud … 9 digit code is Only used for My Cloud Home.

You sure you’re in the right forum ?

anyways, plenty of WD Knowlege Base Articles on the subject

https://support.wdc.com/knowledgebase/answer.aspx?ID=20384