Teams Migration for New Private Channels Stalls
Microsoft began an automated background process to move Teams private channels to a new infrastructure earlier this year. Tenants should check the state of the migration as reported by the Get-TenantPrivateChannelMigrationStatus cmdlet because it is possible that the migration is stalled and waiting for administrator intervention. In most cases, the problem is because of ownerless channels, but archived teams with private channels also stop the migration.