patch files:
/usr/share/pve-manager/js/pvemanagerlib.js
/usr/share/perl5/PVE/Storage/ZFSPlugin.pm

copy
/usr/share/perl5/REST
/usr/share/perl5/PVE/Storage/LunCmd/FreeNAS.pm

UPDATE FreeNAS username and password in FreeNAS.pm

systemctl restart pvedaemon