https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.webjobs.extensions.durabletask.functionfailedexception?view=azure-dotnet
FunctionFailedException Class (Microsoft.Azure.WebJobs.Extensions.DurableTask) - Azure for .NET...
The exception that is thrown when a sub-orchestrator or activity function fails with an error.
microsoft azureclasswebjobsextensions