Your explanation is quite confused
Your activity must be mapped to the role ‘All’ and then you should be this
role to a real group of user. For exempel a group G-Workflow containing all
users having access to the workflow.
You do not have to use the ‘default user’ fonctionnality as this is used to
force a special user.
This way all people will have the right to execute this activity (if it is a
starts activity it will not be listed in the classical way, only in the
start activity tab.
Régis,