Why can't I add invitees on my calendar on my iPhone 6s?

setting->icloud->calendars, turn it on

I have found that the 'Invitee' function is only available with certain email accounts and how they are set up on IOS. It is available with my multiple iCloud, Exchange and Gmail accounts the way that I have them set up. It does not work with my multiple Yahoo accounts or the email accounts from my business website package through GoDaddy. If I find a fix for this issue, I will post the solution.

By any chance any update on this? I can't edit events containing attendees in CalDAV calendar which came from other clients. I can't also add an attendee to a new event which I create for the same CalDAV calendar in iOS. The rest clients including Android and Thunderbird's Lightning works perfectly. Is there any reason why Apple limited this functionality on iOS?

Tapping on edit causes the Calendar app to crash. This is with iOS 9.2 running on an iPhone 6 Plus when accessing calendar invitations sent to me by others. There is no crash when using Edit to access calendar entries created on the iPhone, but then again no invitee field.

Thanks in advance for clues on getting a working invitee field.

OK... I would suggest a Settings > General > Reset > RESET ALL SETTINGS first.

If that doesn't revolve it, then making a backup of the phone and resetting to factory conditions. This will be the only way to "re-install" the Calendar app as it's built in to the iOS.

Thanks for this. After resetting all settings, I realized this is a server-side issue.

I should have mentioned that I sync with open-source, non-iCloud servers that fully support the CalDAV protocol -- one cluster that runs DAViCal 1.1.3.1 and another server running Baikal 2.7. Both these support invitations and replies with Thunderbird's Lightning extension and on Android phones (anecdotally; I have not verified that).

After enabling iCloud calendars and creating a calendar item in iCloud, the invitee list appears for the iCloud item. The Calendar app still crashes when attempting to edit items created on those other systems. After power-cycling the iOS device, editing a calendar item might work once or twice, but it does not show invitees under Edit.

Yeah... that would have been nice to know.

My guess would be that these non Apple standards will have to catch up. iOS 9 is only a bit over 3 months old, so you may want to ask "them" when they expect to be back in "compliance" if at all. Do they not have a recommended client?

Not enough evidence here to exonerate either side. I need to go read the RFCs 4791 and 6638, and then sniff some packets to see why this works with the other clients talking to the same servers, but not Apple's clients.

As noted, the Lightning extension to Thunderbird works fine in all cases, Apple and non-Apple. Ján Máte wrote a web client called CalDAVZap that also works with invitations.

Also, the iOS Calendar crashes when hitting Edit. That shouldn't happen, regardless of who implements the RFCs.

When you tap on an existing event, tap on EDIT... do you see INVITEES?

INVITEES should be also there when you create a new event, below where select which Calendar to add the new event to.

Correction: It's not really a server-side issue, but rather a client-dealing-with-different-servers-all-implementing-the-same-protocol issue. :-)

If you say so.

🙂

rocketsmj - Brilliant! Thanks..that did it.

Thanks. Worked perfectly!!