Thanks for your report.
Duplicate of #170, please follow up there.
DAVdroid 0.8.1 with Zimbra 8.6.0_GA_1178
I have a read only view of another user’s calendar from the server same server, the reverse applies.
In some instances the following issue occurs:
In the instance where the event is not appearing in one user’s calendar:
did you make sure that you select the correct DAVdroid account from the dropdown when creating the event? Does the other user who accepts the event choose the correct calendar to save it?
Can you maybe provide a test account on your Zimbra server? We don’t have one to test currently. Can you send it to email@example.com?