ID:20796 When you disable eFuses for encryption key storage, you must specify Battery Backup RAM or Physical Unclonable Function option for the Encryption Key Storage Select parameter on the Security menu.

CAUSE: Cannot disable encryption key in eFuses if Encryption Key Storage Select is eFuses.

ACTION: Set Encryption Key Storage Select parameter on the Intel Quartus Prime software Assignments > Device and Pin Options > Security menu to Battery Backup RAM or Physical Unclonable Function.