ios 17 Calendar Issue - Outlook

Hallo -

I am having an issue with ios17 and Outlook email on a work email account:


I am using ios17.0.2. When I receive a meeting invite from an external account it is going to my junk mail. However, it appears in my iPhone ios native Calendar app. If I accept the invite in the app i receive an error on my phone, however, my Outlook account the sends a meeting invite, from my Outlook profile, to all the recipients of the original meeting, under my name. It's bizarre.


We've narrowed it down to ios 17 by doing the following:


Running the issue on 2 other phones. Both iPhone 14. One running ios16, the other running 17.0.2. Both phone's were wiped clean prior to testing.


  • When we ran the invite test on ios 16 the invitation was in my Outlook junk folder. It appeared in the native calendar app. When hitting "Accept" the phone simply gave me an error that it couldn't accept an invite and send the response.
  • When we ran the test on the phone with ios 17 it provided the exact same error, however Outlook then generated its own invitation, with the same subject heading as the one I received, and sent it to the entire distribution list of the original invite, except with a different time and under my account.


Needless to say, this is creating some confusion and wreaking a bit of havoc.


Thoughts?

iPhone 7, iOS 13

Posted on Oct 2, 2023 9:10 AM

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Question marked as Top-ranking reply

Posted on Oct 22, 2023 8:09 PM

My company has been tracking this issue since iOS 17 was released. We've had a few bad ones involving all company Town Hall type invites being sent out. A lot of pressure from up high on how to block these due to concerns over brand and reputation.


We've determined that every invite generated with this issue:

  1. Has a blank body (ie: Notes field).
  2. Has a date which is always the current day rather than out in the future. (This helps with knowing which moderated messages to approve, keep reading)


After some research I came up with a Transport Rule in O365 to moderate these messages. It comes with a small catch that whomever you choose to moderate the messages will get hit with a bunch of false positives. You can tell it's a false positive if the meeting date is in the future versus that day. Seems a good number of people create calendar invites from their mobile devices with just a title and nothing in the Notes field. However, this transport rule was tested to fire only for mobile invites and not OWA or Outlook.


Rule description

Apply this rule if


Is message type 'Calendaring'

and Includes these patterns in the message subject or body: '^$'

and Is received from 'Inside the organization'


Do the following


Forward the message for approval to (add your own moderation group)


Except if


Includes these words in the message subject: 'Canceled' or 'Declined' or 'Tentative' or 'Accepted'

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40 replies

Oct 11, 2023 1:35 PM in response to elden1337

Oct. 11 Update--I contacted support, I have an ongoing ticket open. Of course I had to explain that no it's not something I'm doing, no I can't reproduce this for you live, no there's nothing to see in the Calendar inbox screen that tells you anything useful; I sent some screen shots, hoping to hear back this week or next. Will update this thread. The fact that I had other support discussions on this site to direct the rep to was very helpful in conveying that it's not just user error or Microsoft's fault--thanks all for documenting this here!

Oct 13, 2023 4:56 PM in response to hlk1971

Thanks.

I’m skeptical because the issue described in the Reddit post is the same, but the solution in the comments is different. Also, they reference it taking place prior to iOS 17. Were convinced it’s a 17 issue because we’ve got a series of phones we left on 16 and it’s not happening on those, even when using the same invite.


let us know if it works on your end. In meantime, has anyone been able to get acknowledgment from Apple on this?

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ios 17 Calendar Issue - Outlook

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