I use the calendar function in my setup and this worked for more than over 2 years. Suddenly it stopped working without a known reason.
user = email@example.com
secret = trytofindit
Because my setup/version was EOL i’ve upgraded a copy to asterisk 18, but still no improvement and for me very difficult to debug… The calendar is accessible in eg thunderbird, so no technical issue with another app and loging in in the calendar. But how do I check the detailed handshake between Asterisk and this caldav calendar ?