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For all the Certification and Trailhead issues please report it here,
https://trailhead.salesforce.com/en/help?support=home
https://trailhead.salesforce.com/help
So that our trailhead support engineers will look into it and get back to you.
Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Regards,
Salesforce Support.