I have send already an eMail, but now I received the confirmation mail.
Equipment: Android 9.1 based Huawei P20, Calendar is acalendar+, Davx5, Thunderbird 60.x, Synology NAS DSM 6.2
- Make Calendar entry at smartphone with alarm
- Edit entry at synology frontend or thunderbird to remove alarm not possible (no error message, you just see it if you oben the entry again.
- Vice versa it is no problem, you can edit entries which derived first from frontend or thunderbird.
Either Davx5 introduce a writeprotection or acalendar+ is doing so.