Hi CALZI Olivier!
Thank you for reaching out to Microsoft’s Community again.
As we understand, you need to change the MSA (Microsoft Account) associated to your Certification profile. We will be happy to assist you with your inquiry.
We have started a Private Message where we will request details regarding your account to complete an evaluation process. You can access this private message on the top right corner of this page, as shown in the image below:

To protect your data, send the information over the Private Message and once we have received your comments, we will validate the profile and get back to you with updates.
We look forward to your response. In case we do not receive an answer within two business days the thread will be closed and locked and you will not be able to reply through either channel.