I am a happy user of DAVDroid with Nextcloud on my phone running LineageOS. I tried to add a birth date on a contact from my phone, but upload strangely fails with a 404 error. I can not understand where the issue comes from and I hope someone can help here.
Here is the DADdroid log (sanitized), and here is the corresponding Apache access log:
192.168.1.254 - - [05/Oct/2018:10:27:33 +0200] "PUT /remote.php/dav/calendars/yvan/contact_birthdays/contacts-pas-id-565B107600000032.vcf.ics HTTP/1.1" 404 1655 "-" "DAVdroid/2.0.4-ose (2018/09/ 10; dav4android; okhttp/3.11.0) Android/7.1.2"
When I type the above URL in my browser, the server returns the ICS file.