When I bought an Education version, the email I received included details instructions of both what to submit, and where
Did the email you received not include such detailed instructions?
Welcome to Adobe Forum,
Please refer to the link below for a list of eligible documentation we would accept:
"Education Online Store FAQ" on the Adobe website at www.adobe.com/uk/support/service/ts/documents/ols_edu_eu.htm
You will have to log in to www.adobe.com & go to "my open support cases", please attach the document in case # 0212634059.