Hi Albert,
It sounds like Microsoft Learn has created a new profile for your new work email, so it's not showing the learning history from your old account.
Try signing in to Microsoft Learn with your old account and add your new work email under Profile Settings > Account Management. This usually links or merges the profiles so your badges, certifications, and learning progress appear again.
If you no longer have access to the old email, you'll need to contact Microsoft Learn Support and provide both email addresses so they can help recover or merge the profile.
Harry.