Users may intermittently be unable to “Reply All” to email messages using a group mailbox in Outlook on the web

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: So far our efforts to reproduce the issue internally with a test account have been unsuccessful. However, we’re continuing with our efforts to reproduce the impact to help us determine what other factors may be contributing to the issue and determine our next troubleshooting steps.

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: Monday, October 2, 2023, at 7:00 AM UTC