A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
That message indicates the site’s classification value is no longer valid for the connected Microsoft 365 group, so SharePoint blocks saving the site information until a valid classification is selected.
Use this path first:
- Open the SharePoint site.
- Select Settings > Site information.
- In the classification field, choose one of the currently available classifications.
- Select Save.
If the site is a team site connected to Microsoft Teams, edit the classification from the corresponding team’s settings in Microsoft Teams. For team-connected sites, the site description or classification is managed from Teams.
If the classification list itself is wrong, missing, or outdated, the correction is at the tenant classification settings level. Those settings can be updated or removed by an administrator by updating the Group.Unified directory setting, for example with Set-AzureADDirectorySetting, or removed with Remove-AzureADDirectorySetting. After changes, it can take an hour or more for the updated settings to appear in the Microsoft 365 UI.
Also verify permissions:
- Changing site name and site information requires owner or designer permissions on the SharePoint site.
- If Site information is missing or unavailable, the change must be made by the site owner or SharePoint admin.