The most likely reason the 10GBase-T adapter installed in the StoreOnce 3620 is not configurable is that the customer failed to install a License to Use (LTU) for it (Option C). HPE StoreOnce systems require an LTU for certain hardware components and features. Without the appropriate license, the system will not recognize or allow configuration of the newly installed hardware.

Ensuring that the LTU is correctly installed would likely resolve the issue and allow the adapter to be fully operational.

References:

HPE StoreOnce Overview

HPE Licensing and Support