Title: Users may intermittently be unable to “Reply All” to email messages using a group mailbox in Outlook on the web
User impact: 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.
Current status: Our review of the reproduction has led us to identify PostGroupItem API is failing and returning an error message of “Error Invalid PropertySet”. We’re investigating further into the API behavior so we can understand what other factors are contributing to the underlying cause of the issue and to help us identify our next steps towards fully resolving the problem.
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.
Start time: Friday, August 4, 2023, at 5:32 PM UTC
Root cause: A code change meant to improve conversation grouping is causing the intermittent “Reply All” impact.
Next update by: Tuesday, September 26, 2023, at 7:00 AM UTC
