Prevents apps using an Azure Access Control (ACS) app-only access token to access SharePoint. ACS, a service of Microsoft Entra ID, has been retired on November 7, 2018. This retirement does not impact the SharePoint add-in model, which uses the https://accounts.accesscontrol.windows.net hostname (which is not impacted by this retirement). For new tenants, apps using an ACS app-only access token are disabled by default. We recommend using the Microsoft Entra app-only model which is modern and more secure. Note that marking this property to $true doesn't prevent creating apps in SharePoint that use an Azure Access Control (ACS) app-only access token. Marking this property to $true only ensures that such apps can't access SharePoint anymore.
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