What is the user "Do Not Touch, Portal Users Synch" in my PPM SaaS environment?

Document ID : KB000111516
Last Modified Date : 17/08/2018
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Question:
I can see a user named "Do Not Touch, Portal Users Synch" (ca_portal@dummy.com) in my PPM SaaS environment. What is it used for?
Environment:
All PPM SaaS environments.
Answer:
This user is required to create and synchronize the users between the SaaS Portal and PPM, so this is a resource for internal OD purposes and specific to these environments only. It must not be locked or inactivated on any environment (or touched in any way).