WD passport serial number is showing invalid

Hi, I bought wd my passport 1 TB from Amazon India . But when I’m trying to register my product it says invalid serial number. I’m using the number that is printed on the label and printed on the hard disk and have double-checked the serial number. Any solutions?

Brother i transferred my documents to that hard disk, now if i will return after formatting it the seller can recover my data,

What is the best way to prevent my data from discovery