Teams and Copilot are changing addresses: update your firewalls

Microsoft is changing the destination addresses for two major services, redirecting M365 and Teams web users to copilot.cloud.microsoft and teams.cloud.microsoft. This transition, detailed in MessageCenter posts MC1465764 and MC1462915, is already underway for Teams and now includes M365. Organizations must update their systems, documentation, and network controls, including firewalls, proxies, and secure web gateways. These updates on client devices are essential to maintain uninterrupted access to these popular Microsoft services for all users.