Hi,
Could you please tell me that what’s the update in the meeting request? Is it the meeting’s time?
I did a lot of tests and noticed that Outlook would decline the meeting’s update if there is an overlap between original time and update time of the meeting.
Personally recommend you to re-accept the meeting via finding the meeting request in the Deleted Items as a workaround.
In addition, it is suggested to go to
Outlook Uservoice Forum and submit feedback.
Hope this can be helpful.
Regards,
Aidan Wang
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