https://www.veritas.com/support/en_US/article.100045504
/usr/openv/netbackup/bin/admincmd/nbemmcmd -listhosts /usr/openv/volmgr/bin/tpconfig -delete -nb_appliance <appliance name>
Then use nbemmcmd to remove the appliance machine type.
/usr/openv/netbackup/bin/admincmd/nbemmcmd -deletehost -machinename <appliance name> -machinetype appliance
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