Symptoms

You backed up a private channel in Microsoft Teams. Later, you deleted the channel and want to restore it from the backup.

Restore fails with this error:

A backup agent error: 'Channel Channel id=<id> was not restored

Files folder of Channel id=<id> is not ready. Recovering of Channel's messages impossible

Cause

Files folder of a private channel is not created until the user opens the Files tab of the channel in Microsoft Teams UI.

Solution

1. In Microsoft Teams, open the channel.
2. Click Files.
3. Click Open in SharePoint.

Now you can re-attempt recovery.