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 '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.

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

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

Non-nullable property 'DeviceCode' 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.