[SOLVED] Durable Function error "Authorization failed. These requirements were not met: [...].Security.Authorization.FunctionAuthorizationRequirement"

Durable Function error "Authorization failed. These requirements were not met: [...].Security.Authorization.FunctionAuthorizationRequirement"

I followed quickstart-python-vscode and deployed an example Durable Functions app.

When I try to call the /api/orchestrators/hello_orchestrator endpoint, I am getting the following error:

2025-01-07T09:28:05Z   [Verbose]   Request successfully matched the route with name 'http_start' and template 'api/orchestrators/{functionName}'
2025-01-07T09:28:05Z   [Verbose]   AuthenticationScheme: WebJobsAuthLevel was not authenticated.
2025-01-07T09:28:05Z   [Verbose]   AuthenticationScheme: Bearer was not authenticated.
2025-01-07T09:28:05Z   [Information]   Authorization failed. These requirements were not met:
Microsoft.Azure.WebJobs.Script.WebHost.Security.Authorization.FunctionAuthorizationRequirement
2025-01-07T09:28:05Z   [Information]   Executing StatusCodeResult, setting HTTP status code 401

Solution

It turned this cryptic error message meant I was passing a wrong, outdated function key in the x-functions-key header.

Using an up-to-date key from "Function App / App Keys" solved the problem.