Found it! Need to add ApiController attribute to all routes (also derive from controllerbase)

server/AyaNova/Controllers/ApiRootController.cs

@@ -14,7 +14,8 @@ namespace AyaNova.Api.Controllers
     [ApiVersion("8.0")]
     [Route("api/v{version:apiVersion}/")]
 	[AllowAnonymous]
-    public class ApiMetaController : Controller
+	[ApiController]
+    public class ApiMetaController : ControllerBase
     {
         private readonly ApiServerState serverState;
         private readonly ILogger<ApiMetaController> _log;