Seagate Exos OEM Question (bought from Newegg)

Hi guys, need advice here.

So I received my Seagate Exos X20 20TB I bought from Newegg (sold and shipped by Newegg and was advertised on its page with 5-year warranty) today and successfully registered it on Seagate website for 4 years warranty. But when I contacted their online support to try to adjust it to 5 years they said the drive is an OEM drive and Seagate will not honor any warranties from the drives.

How is it that it is OEM but was registered with warranty up to 2027 on Seagate website? What is the verdict here?