Microsoft Certification / Training is supported on their own forums. I'd logon here with same credentials used for testing
your Microsoft Certification dashboard
and if not found you can request help with profile linking / merge in dedicated forums here. (Participate\Ask A Question)
Certification Profile/Certification Dashboard
Certification Profile/Incorrect/Missing Information
Certification Profile/MCID Assistance
Certification Profile/Account Linking
--please don't forget to Accept as answer if the reply is helpful--