Microsoft 365 Calendar Won't Sync with iPhone or Webmail Using Exchange ActiveSync

Barry Manovich 0 Reputation points
2024-10-18T15:41:37.8366667+00:00

Following is the Issue

Outlook Desktop Exchange ActiveSync connections stopped working in Version 2401

Outlook for Microsoft 365 - Last Updated: February 29, 2024

ISSUE - After updating to Version 2401 (Build 17231.20182) Outlook stops connecting when using the Exchange ActiveSync (EAS) protocol.

STATUS: FIXED - This issue is fixed in Outlook Desktop Version 2402 (Build 17328.20068) and higher.

The EAS connection was restored in the above fix. However, it’s in this version 2402 (Build 17328.20068) where the MS 365 calendar syncing issue started.

The 2402 (Build 17328.20068) update created another issue. One would think that the backend engineers can go back to Version 2312 (Build 17126.20132) and compare it to subsequent updates to see where the issue is. It just seems so simple for them the check it out.

Version 2312 (Build 17126.20132) works just fine. No sync issues. The issue is with subsequent updates starting with Version 2402 (Build 17328.20068). As a result I have stopped getting updates on my subscription until the issue is resolved.

On occasion I would check to see if a fix has been put in place, but that has not happened to date. After checking, I would have to revert back to Version 2312. One would think after 9 months, MS would have fixed it already.

Please let me explain exactly what the issue is.

  1. If I make a calendar entry on webmail, it shows up on webmail, iPhone and MS 365 Outlook Calendar.
  2. If I make a calendar entry on iPhone, it shows up on webmail, iPhone and MS 365 Outlook Calendar.
  3. If I make a calendar entry on MS 365 Calendar the entry will NOT show up on webmail and iPhone, but will show up on MS 365 Outlook Calendar.

So, it's only when an entry is made through my MS 365 Outlook calendar is where the issue is.

Many other MS customers over the last nine months have commented on the community post I made, that I are experiencing the same issue.

I also have screenshots to illustrate the issue.

I've been trying to get MS to resolve this issue for NINE months.

Please HELP.

Barry

1-403-863-1139

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  1. Anonymous
    2024-10-21T06:14:33.77+00:00

    Hi, @Barry Manovich

    It sounds like calendar sync issues are really only present in MS365 Outlook.

    Unfortunately, as a public platform, we don't have enough permissions to compare versions.

    So I'll provide some general workarounds about calendar syncing:

    1. Regularly keep an eye on the latest updates to see if they get a permanent fix.
    2. In the Outlook, go to the Calendar pane, right-click on the calendar folder, select Properties, and select Clear Offline Items. This will resynchronise the calendar with the server project.
    3. Delete the email account from Outlook and add it again.
    4. Contact phone support to get a more in-depth investigation. Customer service phone numbers - Microsoft Support

    The general approach to this problem is mentioned in the following cases for your reference.

    Outlook 365 Calendar will not sync with mobile devices - Microsoft Community

    Calendar appointments in Outlook won't sync and show with Iphone? - Mobile Computing - Spiceworks Community


    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".


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