MC688930 — Teams admin center: App centric management and changes to app permission policies

Teams admin center is updating to app-centric management with three phases: Phase 1 (auto-migration for single policy customers) is complete. Phase 2 (self-migration) is extended to mid-May 2025. Phase 3 (auto-migration for remaining customers) starts mid-April and ends June 2025. Detailed documentation is available [here](https://learn.microsoft.com/microsoftteams/app-centric-management).