Recommend you go to your https://www.microsoft.com/en-us/learning/dashboard.aspx and validate,
Also, you can try scheduled an Exam and verify if you have the discount voucher (I didn't receive my email but i had te voucher in my dashboard)
Hope this helps,
Carlos Solís Salazar
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Please "Accept as Answer" and/or Upvote if any of the above helped so that, it can help others in the community looking for remediation for similar issues.