public static OptionsBuilder <TOptions> AddAdminSiteOptions
<TOptions>(this OptionsBuilder <TOptions> optionsBuilder,
Action <TOptions>?configureAdminOptions = null)
where TOptions : SharePointSiteAuthorizationOptions =>
optionsBuilder.AddNestedNamedOptions(
SharePointSiteAuthorizationOptions.AdminSiteOptionsName,
configureAdminOptions,
GetAdminUrlFromSiteUrl
);