In April 2023, Microsoft announced that it would be undertaking a multi-year effort to reduce domain fragmentation among authenticated, user-facing Microsoft 365 apps and services by bringing them onto a single, consistent and cohesive domain: cloud.microsoft. This consolidation will help improve security, administration, and user experience across the board, and will ultimately lay a foundation for better and tighter integration across the Microsoft 365 ecosystem.

Source: GBHackers