could you also make your scr to:
? "ingroup returns for domain users:"
InGroup("Domain Users")
? "with errorcode:" @error
? "ingroup returns for Guests:"
case InGroup("users") ;changed the group
? "with errorcode:" @error
get $dummy

also, if you could use test with user only on domain users not guests.
I changed the script as don't like the idea of a user belonging to guests and users at the same...

this also can cause the problem as guests group is a restrictive...
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