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Although Learn profiles can be merged, you cannot merge two Learn profiles with personal email accounts. The workaround is to use a work account as a bridge:
- Sign into Learn with your old personal email account
- Link a work email account to your old Learn profile https://learn.microsoft.com/training/support/learn-profile-manage#add-login-accounts-to-your-learn-profile
- Sign into Learn with the work email account
- Remove the old personal email account from the Learn profile
- Link (and merge) your new personal email account to your Learn profile https://learn.microsoft.com/training/support/faq?pivots=profile#can-i-merge-two-profiles-of-mine-into-one
- Optionally, sign into Learn with the new personal email account and remove the work email account