What key mode is currently associated with the user's keypair?
What key modes are currently in use for the user's policy on the SEMS?
What key mode was previously used by this user (either in another group/policy, or before changes were made to the key mode in his current policy)?
Was there a change made to key modes allowed on the server?
Is there a specific need to change the user's key from SKM to CKM/GKM?