And in the other unit

Is this 'unit' the script update_tables-development.cgi or another package ?

Tried different variations of qw(LogggedOn.. and qw($LoggedOn.. Neither worked.

Why the .. ? now I'm guessing what you tried.
If you tried LogggedOn_user_id then obviously that won't work with 3 g's in it

If you tried LoggedOn_user_id did you have LoggedOn_user_id in @EXPORT_OK? The code shows only $LoggedOn_user_id which is a scalar not a method.

If you tried $LoggedOn_user_id what error did you get ? I assume the error shown LoggedOn_user_id is not exported by the manageuser relates to the previous try with LoggedOn_user_id
poj