You cannot create users to a CRM Online using Scribe, you can only update them.
I have this issue recently and my solution was:
Create a DTS to create an CSV file* with the users: You can add the users using the Office portal or through the PowerSehll.
Creates a DTS with all the other information about the users (The CSV is pretty basic, so you will need to add all the other information related to every user).
Create a DTS with the relation between Users and Roles
*You can see the csv format in your Office portal, under Users->Active Users->Bulk add
https://portal.office.com/default.aspx#@/UserManagement/ImportFile.aspx?refer=%2FEAdmin%2FUser%2FActiveUsers16.aspx
Maybe there is a quicker way to do it, but this was the approach I found.