hp 12gb sas expander

I am attempting to add drives to my Windows-based backup server using it's existing P420 hardware RAID HBA and I'm not having any success. I purchased a 9-port (36-drive) HP port expander (G9 HP 727250-B21 727252-001 761879-001 ) and, while it recognizes all of the drives some of the drives...

Bought way too much gear for my home lab and in the process of inventorying all the excess HW and will be updating this thread. I've not done international shipping before and not familiar with the process. So, I'd prefer to limit it to CONUS but open to the idea of outside US. Prefer PayPal...