The way I proceed, that accessToken is fetched via refresh token.

https://oauth2.googleapis.com/token?refresh_token=1//05Xa...

The events, first page of events are fetched. At beginning no pageToken is used. In the returen date there is also a pageToken. I fetch again. The next result will have only nextSyncToken, I used that with https://www.googleapis.com/calendar/v3/calendars/urcr7s1cb

The surpricing, that the calendar I am fetching has 3 item from 2024-06-11 but in the datas which are returned, onlí one 2024-06-11 item exist. What am I doing wrong?