Drobo 5N - How to Unregister/Reregister

I have recently sold my Drobo 5N. The new buyer is unable to register it on the Drobo site with his information.
How do I remove it from my name, so that he can register it to his name?

Thank you!

I’m pretty sure at least one you have to contact support and explain the situation to do that, I don’t think it can be done using the online forms.

Thank you. I thought that might be the case. I was hoping there may have been a way to do it online that I missed.
Thanks again!