"No permission" messages mean that you do not have access to perform the command.
Check permission using the appropriate NIS+ commands, described in "Advanced FNS and NIS+ Issues". Use the nisdefaults command to determine your NIS+ principal name.
Another area to check is whether you are using the right name. For example, org// names the context of the root organization. Make sure you have permission to manipulate the root organization. Or maybe you meant to specify myorgunit/, instead.
If you do have permission, then the appropriate credentials probably have not been acquired.
This could be caused by the following:
A keylogin has not been performed (defaults to NIS+ principal "nobody")
A keylogin was made to a source other than NIS+
Check that the /etc/nsswitch.conf file has a publickey: nisplus entry. This might manifest itself as an authentication error.