User gets "Sorry ! You are not authorized to view the contents of this file" when trying to enroll.

User gets "Sorry ! You are not authorized to view the contents of this file" when trying to enroll.

 
Sorry ! You are not authorized to view the contents of this file
User was sent an enrollment invitation email. User then selects link in email and is sent directly to the ADDSP login page. User tries to login and gets:
 
"Sorry ! You are not authorized to view the contents of this file"
 
Where can I check to see if user has the correct permissions?
 
Thanks

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