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Calendar sync one way

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Hello,

I use DAVx5 to sync Business Calendar on my Fairphone 3 (Lineage OS 18.1) with my Lightning (Thunderbird) Calendar on my computer (Windows 10). My calendars are hosted on Posteo.de. When I make an event in Lightning, it shows up in my phone, but not the other way around.

Itried making new events with each of my other 3 calendars that I have synced with posteo (Arbeits Kalendar, Task Calendar, WG Kasse Kalendar). All 3 of the other calendars work, just not Standardkalendar. The calendar URL in Posteo.de matches the url given in DAVx5 for Standardkalender (and all others, of course).

I already wrote DAVx5 support. I checked if events made in my phone at least show up in my posteo.de web browser calendar. They do. The guy helping me suggested it could be that Lightning does not chech E-Tag / C-Tags correctly to determine what's new on the server.

I also tried turning off "Offline Support" for Standardkalendar, but the problem persists.

Could you please help me solve this problem?

Thank you, David Plessy

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