Worked perfectly the very first time. I think some people perhaps are using the “Sign up” at the top of the webpage rather than using the actual Sharewareonsale referral thus not getting the SOS offer.
When you log in for the very first time after creating your account the storage does say initially 10GB but a few moments will refresh to 20GB, or simply you can log out and back in again.
Thank you SOS and thank you Internxt!