I have installed the OneCalendar app on my new Fairphone 6. Whatever I try the calender does not synchronize. I connect to a Synology calender using caldav. On a google Android it works without any problem, on the murena Android I get a 504 Gateway Time-out. Did anyone successfully install OneCalender on a Fairphone 6 in combination with Synology Calendar? If so, what settings did you use?