15/09/2023 11:47:00 AM (GMT)
NHSmail Reference : INC38279595
Microsoft Reference : EX673361
Issue Status : RESOLVED
Issue Description : Users may intermittently be unable to “Reply All” to email messages using a group mailbox in Outlook on the web.
More info : Affected users intermittently receive the following error message when attempting to “Reply All” from a group mailbox in Outlook on the web: “This message can’t be sent right now. Please try again later. Set action is invalid for property.” The impact can be bypassed by replying to these messages from outside of a group mailbox.
Final Update : 04/10/2023 09:32:00 AM – Following Microsoft’s additional testing with affected users, they’ve confirmed that their revert of the offending code change has successfully remediated the impact.
Scope of impact : This event may intermittently impact users who attempt to “Reply All” to email messages using a group mailbox in Outlook on the web.
Root cause : A code change meant to improve conversation grouping is causing the intermittent “Reply All” impact.
Next steps : Microsoft are further analyzing the offending change so they can help identify similar issues during their validation and testing periods and before they can result in impact.