So in the lines:
"sessionColumns" => explode($WA_Auth_Separator,"idusers"),
"sessionNames" => explode($WA_Auth_Separator,"idusers"),
it should be
"sessionColumns" => explode($WA_Auth_Separator,"userEmail"),
"sessionNames" => explode($WA_Auth_Separator,"userEmail"),
since I'm using the email address as the unique identifier.
Thanks for your quick response!
enthusiastically...