App roles not usable in "allowedRoles"

I'm using custom authentication using an Entra ID application that provides "app roles". I have assigned users to these app roles and can see the role reflected in /.auth/me in the "roles" claim. However, using a route:

```
{
"route": "*",
"allowedRoles": ["My_Custom_Role"]
}
```

I'm getting a 403 error when accessing the static web app.

I saw the tutorials about a custom GetRoles function which I do not implement in my backend. However, my understanding is that this function is only required if you need to access the roles in the backend API. I only need to use the roles in the staticwebapp.json file.

Is that supposed to work, or is the GetRoles function required anyway?