I am using Thunderbird 143.0.1 (on Manjaro Linux) mail and calendar with NextCloud. I have several calendars and mail accounts, that works fine for about a year. Now I added a new calendar on NextCloud, it works with my calendar app on Android, but not with Thunderbird, whatever I try, it does not show the new calendar and it's content. In the Agenda tab under the calendar, all my current agenda's are shown. At the bottom right there is a sync button, that is supposed to reload the calendars and sync changes, but that does not work for this new calendar. All old tips for syncing are supposed to be integrated with Thunderbird. Any idea? Thanks in advance, Kees