Hello, Fariha.
Thank you for contacting us here at Microsoft Community.
We understand that you need to unlink your work Account as you entered it by mistake and it will not let you schedule your Exam.
We will be glad to assist you in your request. To unlink your account, please follow the steps below:
Use InPrivate browsing in Microsoft Edge.
Clear browsing history, cookies and cached data.
Click on this link to go to Your Dashboard.
Select Edit Certification Profile.
Click on Link Accounts > Unlink.

Now, please click on Removed and your desired email will be unlinked from your account.


Please let us know if you have further questions, we will be glad to clarify them for you. Please bear in mind that if we do not receive a response within two business days, the thread will be concluded.
We are attentive to your comments.
Have an excellent day,