Why is use a pairing code "On" with not way to change it?

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Our parents used to use their student's student number to create their parent account. Now there is something called a pairing code and I can't find much info on it in the guides except that it looks like each individual student has to go turn this on in order for their parents to get an account. I'm in K12 and this makes creating parent accounts harder, not easier. I found it in my settings and it is forced on with no other options. Can someone please help shed some light on this for me?