We have an ArcGIS Enterprise 11.0 windows installation, where the authentication is integrated with Windows Active Directory, either at the user level or at the group level, as shown below:
User Store/Group Store:

If in Windows Active Directory (AD) we add a user that already exists in Portal for ArcGIS to an AD group also mapped in Portal for ArcGIS, when the user authenticated in to the Portal, and he had logged into the Portal less than an hour ago, the refresh membership is not executed, and in the Portal logs in debug mode it appears: "Refresh user membership: No refresh. Interval time has not elapsed."
But if the user has already logged into the Portal for more than an hour, when the user authenticates in Portal the refresh membership is performed, and in the Portal logs in debug mode it appears: "Refresh user membership: In progress for user '.............'. Thread id: 5900287 ".
According to the documentation, whenever a user logs in, the refresh membership should be automatically performed, even if they last logged in less than an hour ago, does anyone know why this isn't happening?
Thanks,
Antonio Sergio