A Trusted Platform Module (TPM) is an example of a hardware-protected data store that can be used to protect cryptographic keys.
Check
Verify the Mainframe Product is configured to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store.
If the Mainframe Product is not configured to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store, this is a finding.
Fix
Configure the Mainframe Product to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store.