Recently Microsoft Learning removed Azure Passes from the Microsoft Official Curriculum in order to provide more resources to their customers. It was noted that they had seen a 775% increase in Azure usage since the beginning of the coronavirus shutdowns. You can find out which courses are affected on the Learn on Demand website here.
New update! As of Friday, April 17, Azure Student Passes are available again for ordering through the Microsoft Courseware Marketplace.
Learn on Demand Systems presented a brief webinar to demonstrate some of the Instructor tools that they are putting in place to help resolve issues with the removal of Azure passes from MOC and other courses. You can find the recording here on Moving Past Azure Passes.