When a team owner or administrator archives a team, any shared or private channels in the team along with their SharePoint Online sites are archived and become read-only. This is fine if the team owner realizes the effect on these channels and their users, but problems might happen when team owners aren’t members of the channels and therefore don’t know of their existence. Unless of course they take the time to check using the Teams Admin Center or PowerShell, which is exactly what happens when archival occurs – or is it?
https://office365itpros.com/2022/04/12/archived-teams-visibility/
