Nullability of reference types in return type of 'T? AsyncBlockingQueueEnumerator.Current.get' doesn't match implicitly implemented member 'T IAsyncEnumerator<T>.Current.get' (possibly because of nullability attributes).

Non-nullable property 'Id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Version' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'WorkerServices' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Argument of type 'Func<object[], Task>' cannot be used for parameter 'handler' of type 'Func<object?[], Task>' in 'IDisposable HubConnectionExtensions.On(HubConnection hubConnection, string methodName, Type[] parameterTypes, Func<object?[], Task> handler)' due to differences in the nullability of reference types.

Non-nullable property 'DeviceCode' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'UrlComplete' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'UserCode' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Url' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.