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It is not possible to transfer certifications from one Learn profile to another due to the privacy and security policies in place. Microsoft cannot do this for you, Learn profiles are self-managed.
You should have added a personal email account to your Learn profile while you still had access to your work account [https://learn.microsoft.com/training/support/learn-profile-manage#add-login-accounts-to-your-learn-profile] to prevent you from finding yourself in the position you are now in.