The AllowSingleSignOnUsingOSPrimaryAccount property is used to enable
single sign on with Azure Active Directory (AAD) and personal Microsoft
Account (MSA) resources inside WebView. All AAD accounts, connected to
Windows and shared for all apps, are supported. For MSA, SSO is only enabled
for the account associated for Windows account login, if any.
Default is disabled. Universal Windows Platform apps must also declare
enterpriseCloudSSORestricted capabilities
The D Programming Language's Unofficial Docs
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The AllowSingleSignOnUsingOSPrimaryAccount property is used to enable single sign on with Azure Active Directory (AAD) and personal Microsoft Account (MSA) resources inside WebView. All AAD accounts, connected to Windows and shared for all apps, are supported. For MSA, SSO is only enabled for the account associated for Windows account login, if any. Default is disabled. Universal Windows Platform apps must also declare enterpriseCloudSSO Restricted capabilities
for the single sign on (SSO) to work.