Teams 2025 Tenant Upgrade Rollback: Policy Reversion Scope Undefined After Failed Change

A tenant-wide Teams 2025 upgrade applies new channel layouts and default Teams policies. A failed upgrade can leave legacy channel settings coexisting with new defaults, creating an inconsistent tenant state.

Documented recovery describes a limited rollback window followed by restoration from a pre-upgrade configuration backup. The guidance is ambiguous about the scope of reversion, specifically whether a rollback restores all team policies or only client-side settings and UI defaults.

The upgrade introduces a policy that restricts private channel creation in shared channels. It is unclear whether this restriction and related policy objects persist after rollback or after a backup-based restore.

Does the supported rollback revert Teams meeting, messaging and channel creation policies in addition to client settings? If recovery is performed after the rollback window via configuration backup restore, which policy objects are guaranteed to return to pre-upgrade values? What is the documented behavior for the private-channel-in-shared-channel restriction after rollback or restore?