Hello @olusegun Akinwumi ,
Thank you for taking time to post this issue in Microsoft Q&A forum.
Since your question is more related to the registration/exam/email, please kindly directly email the Cloud Skills Challenge support team(Microsoft Build: Power Platform Developer Challenge) at challengesupport@microsoft.com for better help.
Thanks for your understanding, have a nice day.
Sincerely,
Tianyu
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