Some of people are facing same problem, reported here and here
Any help will be highly appreciated.

On 15 May 2018 at 23:26, Andre LaBranche <dre@apple.com> wrote:
Hi,

Here are some suggestions for troubleshooting what sounds like more of a Thunderbird / Lightning problem than a CalendarServer problem:

  • Look for any sort of activity or error log from Thunderbird; check for any interesting messages logged either at account setup time or when reproducing this problem.
  • Looking at the server's access log, compare the pattern of requests issued by different clients when reproducing the problem.
  • Maybe try posing this question in a Thunderbird support forum / mailing list.

-dre

On May 10, 2018, at 9:05 PM, Prakash Autade <prakash.autade@gmail.com> wrote:

Steps to reproduce:

2. Added 2 users, postmaster@test.int and abuse@test.int
3. Configured above users account in two separate Thunderbird + Lightning client
4. Created meeting invite in abuse@test.int's account and added postmaster@test.int as attendee


Actual results:

1. Meeting is created in abuse@test.int's account
2. Meeting is synchronised in postmaster@test.int's account
3. postmaster@test.int is not able to accept meeting invitation as no accept/decline buttons are shown


Expected results:

1. postmaster@test.int is should able to accept meeting invitation

Side Note: 
1. With same setup, configured iOS clients(iPhone and iPad) and Android clients(CalDavSync)
2. Confirmed expected result

--
Sincerely,
Prakash P. Autade.
_______________________________________________
calendarserver-users mailing list
calendarserver-users@lists.macosforge.org
https://lists.macosforge.org/mailman/listinfo/calendarserver-users




--
Sincerely,
Prakash P. Autade.