I can't register my Razer Kraken Pro V2

Anyone here to help me with this issue of registering this product?

Try using English US keyboard format We have seen in the past where other English keyboards do not work. Check that you are not mixing the letters and numbers Two ways to register the RAZER products, try both with internet active

• Web
• Synapse

I have 2 products registered before. Here is the pic: https://drive.google.com/file/d/1zabTlv9wHiz2j0oM0sVIjcYESf7TyTEW/view?usp=sharing But only this Razer Kraken Pro V2 I can't register and I already tried via web and synapse version. Here is the S/N: https://drive.google.com/file/d/17Qih2GnBOfzTFshcjYvopw0x4xOEitkJ/view?usp=sharing

So it's Capital HN 1651Dzero34zero1zero85 then RZzero4-zero2zero5zero2zerozero-R3M1

Wait for one of official RAZER support to get in touch with you through this thread

KrissyForYou
Can you please help on how I can register this Kraken Pro V2? I really can't register the product. I already have 2 products that has been previously registered except this one.

Thanks for the assistance, @Sye_The-Vie. I have seen the photo of the serial number and searched for it on our system. However, there are no results found, and it may be the reason why the Razer Kraken Pro V2 can't be registered. Where was this product bought anyway? Please let me know through PM. *Thread locked to curb the conversation to PMs.