EventStream binding / dependency injection issue

[MerrionComputing]

Cannot bind parameter 'esTest' to type EventStream. 
Make sure the parameter Type is supported by the binding. 

If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

This is in the AboutQuery which has dummy parameters added to test attribute based bindings.