Create WorkItem with Author

When I try to create WorkItem with Author field I get an exception

> Response status code does not indicate success: 403 (Forbidden).

I think it is because method CreateWorkItemForIssue in YouTrackSharp.TimeTracking.TimeTrackingService call

> rest/issue/{issueId}/timetracking/workitem

And in documentation api youtrack I see for this call that is has no author

> https://www.jetbrains.com/help/youtrack/standalone/Create-New-Work-Item.html

I think it must be a call with author, described in

> https://www.jetbrains.com/help/youtrack/standalone/Import-Workitems.html

but I can't find it in YouTrackSharp

Inspect CreateWorkItemForIssue in YouTrackSharp.TimeTracking.TimeTrackingService and compare its rest/issue/{issueId}/timetracking/workitem request with the YouTrack work-item import API documentation linked in the issue. Determine how an author is represented and verify that creating a WorkItem with an author no longer produces the reported 403 response.

Written by the indexing model from the issue text.