What I ended up doing to filter suspended users that have never logged in:
I extracted all fields for all users with the following command:
gam print users allfields >allfields.csv
I then sorted the Suspended Users: True
and the LastLoginTime: Never using excel commands
Within excel I had one column that had gam delete user
second column was the suspended username.
I then merged the 2 columns in excel
Copied the contents within the column and ran it from the command prompt
from example:
gam delete user 123abc
I had over 12K users to be deleted so it took a long time but it did complete successfully
Marian O'Hare