Unauthorized to add SubDomain

For some reason, after I try to add a subdomain like "mascots.myschool.org" to my already existing "myschool.org" account, I get an unauthorized error.

Students are listed under "mascots.myschool.org", staff under
"myschool.org", therefore, all staff show up to be added when I created OpenClass, the students I cannot due to error stated.

I followed the directions, but when I get back to the OC window asking to verify the addition of "mascots.myschool.org", it says I am unauthorized.

How do I go about adding my students?

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