Hello Ahmed,
Thank you for reaching out to Microsoft´s Community.
We would like to confirm that we have limited access to the Learn Platform and we can only guide you to connect with their support line, which can only be reached through the Feedback forms in the bottom part of the Microsoft Learn support - Troubleshooting known issues | Microsoft Docs.
Taking this into consideration, for you to be able to change the Email account associated to your Learn account you will need to follow these steps:
Go to your Learn platform.
Log in using your credentials.
Go to settings > Account management
Link the email you want to change.
Switch accounts and then confirm.
To continue the process of accounts linking between your MS Learn and your Microsoft’s Certification Profile please follow the instructions in the link below:
If the assistance given solved your request, please indicate “Yes” to the question “Did this solve your issue?” shown below, so other Learners can benefit from this. Remember your feedback is important to improve our service.
If no response is received, we will proceed to close and lock the case the next business day.
Wishing you an amazing day,