Cannot upload files via minimal API due to authentication scheme being forbidden

[caboodal]

I am attempting to upload a file from my UI to a minimal API endpoint however I get the following log entries: -

[2025-01-09 11:34:07Z INF] (Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationHandler) AuthenticationScheme: Cookies was forbidden.
[2025-01-09 11:34:07Z INF] (Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectHandler) AuthenticationScheme: oidc was forbidden.

I've checked the request and the 4 auth cookies are present and the same API endpoint setup works perfectly with non-form upload type POSTS and GETS.

I cannot find any documentation to suggest any additional configuration is required when using authentication and attempting to upload a file via a minimal API.

[caboodal]

Ignore, suddenly realised what I'd done in our custom authorization process!