I can detect E series from Sancity store manager after 2 years runing
You may verify network connectivity to the storage array controllers and ensure port 2463 is reachable.
https://kb.netapp.com/on-prem/E-Series/Hardware-KBs/What_are_the_network_ports_utilized_by_an_E_Series_array
If physical access is available, check and make sure network cables are connected and that the controllers are both showing the shelf ID on their digital display.
I hope the issue is resolved. If not, please feel free to open a technical case with NetApp Support
