ID:20814 When you disable eFuses for encryption storage, you must specify Battery Backup RAM or PUF option for the Encryption Key Select.

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

ACTION: Set Encryption Key Select to Battery Backup RAM or Physical Unclonable Function. Alternatively do not disable encryption key in eFuses in security option on the Intel Quartus Prime software Assignments Device and Pin Options menu.