Please set a field for each AD group that you want imported into Regroup called "regroupID" that is Boolean. One of our clients said they would set it as Boolean, so not sure this is 100% required, but it worked. Please set the value to TRUE for these groups.
The process will automatically fetch the groups from AD with the attribute "regroupid" set to "TRUE" and create them in Regroup. Then the process will scan for the users in the group and import them into the group.
The following details are fetched from the AD into our db for the users -
phone numbers(home and mobile)
One of our developers found this online for how to set the AD Unique Identifier for group import:
A Microsoft Technet Article explaining the same: