It sounds like you enrolled in the student pack after completing the learning path, which is why you only received the 50% discount. The 100% free certification benefit usually applies only if your student status is verified before you become eligible for the exam voucher.
At this point, a couple of things you can try:
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Check your MongoDB University dashboard again to see if a new voucher was issued after linking your GitHub Student Pack.
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If not, reach out to MongoDB University support and explain your situation; they sometimes make exceptions if you recently verified your student status.
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For future certifications, make sure your student benefits are activated before completing the course.
It’s a small timing issue, but support is your best bet to fix it. For more follow this: MongoDB Community Hub - A place to discover, learn, and grow with MongoDB technologies