To update the email ID associated with your Microsoft exam registration through Pearson VUE, you will need to contact Pearson VUE support directly. They can assist you in making the necessary changes to your account. You can find the contact information for Pearson VUE support on their website or through the Microsoft certification support link.
It's important to ensure that you provide them with the correct details regarding your account and the issue you are facing to expedite the process.
References: