User's account is being blocked when sending a calendar invite through the Teams app (desktop or web) when they include the option to "Add channel" to the invitation. This adds the Teams channel to the invite and includes the Office 365 group members in the invitation.
Issue: When a Group has a large number of external members, this can result in the sender being blocked by Microsoft if they include the "Add channel" option to the Teams invitation. Basically sending suspicious messages to external recipients is consistent with compromised account behavior, the accounts are being flagged and in some cases blocked from sending additional messages.
Workaround: If the Office 365 Group includes a large number of external members you should not include it as a channel on the meeting invite. People can invite the Group, they just shouldn't add the channel. Outlook on the web and Outlook desktop clients do not have the option to add a channel to the invitation so they don't run into this issue.
Status: Microsoft has resolved the issue.
Owner of a Team is unable to create tags, they receive an error message in both the web and desktop application.
- Issue: When an owner of a team attempts to create a tag, an error message populates indicating the following: "We had trouble applying your changes. Please try again later." This error occurs due to a corruption of the users membership data.
- Workaround: User needs to be removed from the team by another owner. Once removed, they should be re-added to the team and promoted to owner. User should then be able to create tags. If there are no other owners of the team, promote a member to owner and ask them to perform the above steps