New Update - Teams Device operations cancellation in TAC that are unable to execute!
Teams device operations in TAC (Teams Admin Center) will no more be queued up indefinitely. Microsoft is making changes on how the operations queue will behave with parked tasks. Please read out below for more information.
Behaviour Before Change
Teams administrators frequently use Teams Admin Center to submit/create operations for Teams devices. Currently, whenever an operation is created/submitted, it goes into the Queued state before it is picked up for execution. Additionally, if the device is offline, the operation stays in the Queued state indefinitely until the device comes back online.

Behaviour After Change
With this change, the operation that is in a Queued state, will stay that way only for a maximum of 7 days. After that time-period has elapsed, the operation will automatically be terminated without execution and marked Cancelled. Administrators can re-submit the operation after this, if they wish to try again.
What will happen to the operations already in queue, once this change is implemented
If the administrators already have operations in the Queued state for more than 7 days when this change comes into effect, those operations will get Cancelled immediately. If the operations have already been in the Queued state, but for less than 7 days, they will get Cancelled as soon as the time-period elapses.
Change Schedule
The change is expected to start in late April 2022 and should be completed by early May 2022. The change will be implemented automatically, admins don’t have to do anything.
List of tasks that are referred as Operations here
Operation here refers to the following actions -
• Software update
• Restart
• Download device logs
• Configuration update (update of settings or assignment of configuration profiles)
• Sign-in users from the Teams admin center
• Sign-out from the Teams admin center.