So these are the iscsi luns not fc luns, correct?
* FLI does not support iSCSI connections directly. In order for iSCSI LUNs to be migrated using FLI, the LUN type must be changed to FC. After the migration is complete, the LUN type is changed back to iSCSI.
Since you're moving onto ONTAP9.6P2 I would open a case with Support to assist you.