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

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

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'source' in 'RankedEmailAddress? Enumerable.FirstOrDefault<RankedEmailAddress>(IEnumerable<RankedEmailAddress> source)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'fileName' in 'ProcessStartInfo.ProcessStartInfo(string fileName)'.

Possible null reference argument for parameter 'page' in 'PageIterator<Chat, ChatCollectionResponse> PageIterator<Chat, ChatCollectionResponse>.CreatePageIterator(IBaseClient client, ChatCollectionResponse page, Func<Chat, Task<bool>> asyncCallback, Func<RequestInformation, RequestInformation> requestConfigurator = null, Dictionary<string, ParsableFactory<IParsable>> errorMapping = null)'.