Hi @John_Gaspar,

If this manual section creation is officially supported by your school/institution, I'd suggest having an admin use the SIS Import process to enroll the users the next time you need to, rather than manually enrolling from the People tool.  When using the SIS import, users do not need to accept invites, the enrollment just happens.  It's pretty for an admin to create an enrollment CSV file to upload to the SIS Import area of Canvas.  You could also look into doing enrollments via the API, but honestly that's probably way more work with no added benefit compared to using the SIS method.

Hope this helps!

-Chris