Hello Frenzybee3,
Thanks for posting in the Apple Support Communities.
We understand you're looking for assistance with the Beats Flex offer in regards to an Apple Music student subscription, right?
If we have that correct, be sure to check the email address associated with your Apple ID account or student email address for additional details with this offer. We'll include one of the terms and conditions below, and you can find the remaining here: Get a pair of Beats Flex earphones on us, with your Apple Music student subscription. - Apple
Within 30 days after you have become eligible, Apple will email you instructions for redeeming your free pair of Beats Flex earphones. Within 90 days of receiving this email, you must successfully follow these instructions to receive your earphones. You may be given the option to redeem earphones in various colors. If the color you order is not in stock, Apple will send you available earphones in a color of its choosing. The earphones can be shipped to you only at a mailing address in the region in which you have subscribed to Apple Music student.
We hope that's able to help with providing more information on when to expect an email, and how to proceed with claiming the Beats Flex.
Have a great day!