Did you use an e-mail from your university or school?
This is from the Adobe website:
At checkout, you’ll need to provide the name of your school and indicate whether you are a student, educator, or administrator. What is proof of eligibility? Use a school-issued email address: If you provide a school-issued email address during purchase you are instantly verified. (A school email address may include .edu, .k12, or other email domains sponsored by educational institutions.) If you do not have a school-issued email address or your email address cannot be verified, additional proof of eligibility may be requested after purchase. Students and educators at accredited schools Proof of eligibility must be a document issued by the institution with your name, institution name, and current date. Types of proof of enrollment include: • School ID card • Report card • Transcript • Tuition bill or statement Homeschooled students† Proof of eligibility may include: • Dated copy of a letter of intent to homeschool • Current membership ID to a homeschool association (for example, the Home School Legal Defense Association) • Dated proof of purchase of curriculum for the current academic school year |
Underline and italic is mine! It looks like it may be requested after purchase. That means that it is not systematically requested... Only if there is a doubt.