IPrincipal should be ClaimsPrincipal but is WindowsPrincipal - asp.net-mvc-4

Question

I've got a controller with 3 action methods on it, two of which are regular OData calls and a third which is a function. Using Azure AD and ADAL to secure the WebAPI.
CustomAuthAttribute (IsAppAuthorizing Simply checks a web.config entry)
public class OpsmApiAuthorizeAttribute : AuthorizeAttribute
{
/// <summary>
/// Returns whether or not the user has authenticated with ADFS and whehter ornot we are configured to do authorization
/// </summary>
/// <param name="actionContext"></param>
/// <returns></returns>
protected override bool IsAuthorized(System.Web.Http.Controllers.HttpActionContext actionContext)
{
if (HttpContext.Current.IsAppAuthorizing())
return base.IsAuthorized(actionContext);
return true;
}
}
Startup.Auth.cs
public void ConfigureAuth(IAppBuilder app)
{
app.UseWindowsAzureActiveDirectoryBearerAuthentication(
new WindowsAzureActiveDirectoryBearerAuthenticationOptions
{
Tenant = ConfigurationManager.AppSettings["ida:Tenant"],
TokenValidationParameters = new TokenValidationParameters
{
ValidAudience = ConfigurationManager.AppSettings["ida:Audience"],
},
MetadataAddress = ConfigurationManager.AppSettings["ida:MetadataEndpoint"],
});
}
Controller (ByUser is the OData function that does not get proper IPrincple information, other two methods work fine)
[OpsmApiAuthorizeAttribute]
public class ProjectsController : BaseController
{
/// <summary>
/// Get a Project Detail for a given project id
/// </summary>
/// <returns>json</returns>
[EnableQuery]
public IQueryable<OPSM.DataAccess.Database.OpsM.PRJ> Get([FromODataUri] string key)
{
...
}
/// <summary>
/// Get all Projects
/// </summary>
/// <returns>json</returns>
[EnableQuery]
public IQueryable<OPSM.DataAccess.Database.OpsM.PRJ> Get()
{
...
}
[HttpGet]
//[CacheOutput(ServerTimeSpan = 60 * 60)]
public IHttpActionResult ByUser([FromODataUri]string userId)
{
...
}
}