here is the log entry:
2018/09/04 22:07:41.441|3588|0010|Info|CRM: Synchronize(...) called
2018/09/04 22:07:41.453|3588|0010|Verb|Enqueue Inserted.CONNECTION.4211
2018/09/04 22:07:41.454|3588|0004|Verb|Dequeue Inserted.CONNECTION.4211
2018/09/04 22:07:41.470|3588|0019|Info|CRM: maxConcurrency=16
2018/09/04 22:07:41.495|3588|0019|Info|CRM: making request to CRM. Number=01723862021
2018/09/04 22:07:41.531|3588|0019|Verb|Processing scenario 'Default'.
2018/09/04 22:07:41.533|3588|0019|Verb|Creating new HttpClient for Basic authentication
2018/09/04 22:07:41.554|3588|0019|Verb|Performing GET request '
https://if-bi.zendesk.com/api/v2/users/search.json?query=%01723862021'.
2018/09/04 22:07:42.681|3588|0026|Verb|The response is: '{"users":[],"next_page":null,"previous_page":null,"count":0}'
2018/09/04 22:07:42.719|3588|0026|Verb|No matchings found.
2018/09/04 22:07:42.721|3588|0026|Verb|Removed from processing. Number=01723862021
2018/09/04 22:07:42.721|3588|0026|Info|CRM: processing of 01723862021 has been finished