Hi all, I had same issue time ago, but it was a mistake. I have my personal and professional profile. In my personal profile I have my schedules exams, but with my professional profile don't. It could be your same issue? Hope it helps.
Can you guys still see your appointment in your Pearson Vue account? You can get there via the 'exam providers' heading on your dashboard; if so, don't worry. It's just a glitch on your learning dashboard. Your exam appointment is still valid and you can join at the appropriate time either via the link in the confirmation email from Pearson Vue, or from your Pearson Vue account.
There is a global issue on the Learning dashboard bot showing appointments or when renewals are due. This is logged with Microsoft and is being worked on. From the Learning Dashboard https://www.microsoft.com/en-us/learning/dashboard.aspx, If you select Pearson Vue from Exam Providers this is showing my scheduled appointments and I can reschedule from there
Completed exams are not shown on the Learning Dashboard. You will need to select Pearson Vue from Exam Providers on the Learning Dashboard. On the Pearson Vue dashboard, Exam History shows all exams scheduled and taken, and My Score Reports allows you to download your exam result