Missing invitee

Check and turn on Calendar setting in iCloud: in iOS 11 > Settings > Apple ID, iCloud... > iCloud > Calendar (turn on; select: merge [my recommendation]). I had mine off when I attempted to reduce iCloud backup space (which did not help me) and then I forgot to turn on Calendar after testing backup space. One reply below says to turn on Contacts. This did not resolve my issue. I had to turn on Calendar.

Are you trying to use that function on an existing or new invite?

And can you post a picture of the screen when you hit the plus sign in the right upper corner?

It seems like you are missing Travel Time in addition to Invitees

Can you click on the Calendar option and see which Calendar is selected? If possible choose a different one and see if the Invitee option shows up

Tty to restart your phone

Hold off/on and home buttons down together until you see  and then allow normal boot up

Check to see if your issue resolves at that point

Ok here is what you can try for next steps

Back up your phone to iTunes

Then restore as a new phone

See if the calendar works as intended

If Yes - then restore your back up

Please ask if you need help with any of the steps

You will need at least two to three hours to accomplish this with iTunes

I had this problem as well.

I checked my settings and found that the iCloud and contacts settings were turned off, so I turned them back on, and VOILA! I can now add invitees.

Hope this helps you!

Jen

seriously, you need to have icloud turned on just to email a calendar invite? That's more big brother crap for those of us who don't want our information floating around. Thanks again apple