Hi Lia,
Thank you for contacting the Microsoft Community.
I recognize that you have scheduled an exam appointment on a testing center and wanted to change it into online exam. I know the importance of this matter so let me provide you with further instructions so I can assist you swiftly.
In order for you to switch your exam from a test center, you must first cancel your appointment 24 hour prior to your scheduled exam and reschedule a new appointment by selecting the online proctoring option as the test delivery experience. If you initially paid with a voucherless, this will reinstate on your profile after 36 hours depending on its validity. However, if you have used a voucher-code, please know that this is a one time use voucher.
You may utilize this Reschedule and cancellation policy public documentation page for further detail and information.
Alternatively, for immediate assistance, I would also recommend contacting your exam provider directly as they have access to your exam appointment and can provide other options or recommendations. Please reach out to them using the link below:
For Pearson VUE Support: https://home.pearsonvue.com/microsoft/contact
For Certiport Support: Contact us :: Certiport (pearsonvue.com)
Should you need further assistance, please do not hesitate to reach us out and I'll be more than happy to asisst you.
Otherwise, if this solves your problem, please indicate “Yes” to the question and the thread will automatically be closed and locked. In case we do not receive a response, the thread will be closed and locked after one business day. Please be advised that after the case is locked, we will no longer be able to respond. If the resolution provided did not resolve the issue, please post a new question.
Warm Regards,