Issues with GitHub student account extension

[JaehyoJJAng]

Hi everyone,

The GitHub student coupon expires on 2025.01.09, so I am continuously submitting my certificate of enrollment to extend it,

but I keep getting the following error emails.

"""
Hey xxx,

Unfortunately, we were unable to verify your academic affiliation based on the information you submitted on Dec 15, 2024 for @JaehyoJJAng.

Please use your device camera to submit academic affiliation documents.

Once you have resolved the issues with your sumbission, visit us again and reapply.

Have questions? Please seek help via our Student Developer Pack Application FAQ or visit the GitHub Education Community.

💖 The GitHub Education Team
"""

What on earth is causing this?