Azure Queue Triggered Function - The given key '$request' was not present in the dictionary.

Question

I have a function app running in Azure, most functions are HTTP triggers and work fine but I also have 3 or 4 queue based triggers.

About a week ago these functions stopped working, when the queue receives an item it is correctly triggering the function, however it is immediately throwing;

The given key '$request' was not present in the dictionary.

I am really stumped on to what is causing this so any advice would be much appreciated.

Answer 1

So, this ones my fault, and a rather obvious problem once I realised.

The function app HTTP endpoints use Azure AD authentication, with each function being injected with the 'ClaimsPrincipal' in the constructor.

I had made a change to the queue triggers to also expect this ClaimsPrincipal, which doesn't exist on a queue triggered function.

So in short, don't try to pull user context or claims from a queue triggered function and you will be fine. Also a slap on the wrist for not testing properly!