I'm at my wit's end! Can an someone walk me through getting licenses for my students?

This is what I've done. I've created my school's Office 365 admin account. I've purchased an A3 office 365 faculty and student license under education licenses. However, this is where the problems arise.

When clicking on purchase licenses I get this page.

If i skip this and go directly to the educationstore.microsoft.com and click on "buy". I'll be taken to a checkout screen, and once I click on "payment method" it will say :
So...the only way I can figure out how to get my students Minecraft education edition is by giving EVERY student an A3 office license, which would run the school nearly 2USD/month/student @25 students = 50USD per month just to play minecraft edition. (Now obviously , i know that is not the way to do it, but what am I doing wrong?)