There have been capacity problems for Azure Functions in the Azure regions that power westeurope-1 and az-eastus-1 . Since CDF Functions depend on Azure Functions, this affected the ability of CDF Functions to scale beyond 1 concurrent call for each function. The capacity issues are now alleviated somewhat, so that CDF Functions should handle at least 5 concurrent calls for each function. We are continuing to monitor the situation and working with Azure to get back to normal capacity.