There isn't much you can do except contact Pearson Vue support on the link in your post and reschedule your exam or contact Certification Support at https://aka.ms/CertificationSupport

They should reschedule you for free if you have had problems

Before your exam run a system test to make sure everything is working properly https://service.proctorcam.com/system_test?customer=pearson_vue&clientcode=MICROSOFT
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