'ISystemClock' is obsolete: 'Use TimeProvider instead.'

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

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

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

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

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

'AuthenticationHandler<ApiKeyAuthenticationOptions>.AuthenticationHandler(IOptionsMonitor<ApiKeyAuthenticationOptions>, ILoggerFactory, UrlEncoder, ISystemClock)' is obsolete: 'ISystemClock is obsolete, use TimeProvider on AuthenticationSchemeOptions instead.'

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.

Possible null reference assignment.