Hi @Stephen
Users' Microsoft Teams clients may have frozen when attempting to access the Teams menu in the sidebar.
According to our research, this is due to a recent service update introducing an issue where a user's default channel information is not being recalled as expected in the new Microsoft Teams, causing the impact.
Impacted users may have been able to resolve the frozen client issue by proceeding with the following steps:
- Sign out of Microsoft Teams.
- Completely close out of the Microsoft Teams client by right-clicking on the system tray and hitting "Quit Teams", or by closing the browser window.
- Reopen the Teams client and sign back in.
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