when i add new calendar subscription to Thunderbird Lightning Calendar extension calendar and tasks does not sync. I used Fiddler to see where is a problem and I found out that server replies with the folowing error after request with authorization header is sent.
I also tried https://domain/remote.php/dav/calendars/username/calendar_name/ type of URL with same result.
I use 2 step authentication so i had to generate api password on personal page. (However I also tried non-2step auth account) Does anyone know how to get it working?
No error logs related to this issue.