Here I suppose the LDAP module that returns last name, gives you "decoded utf8 string". What do you see in log.txt file? and any warning message?
my $lastname=''; #here put the return value of LDAP
open( my $fh, ">:encoding(UTF-8)", "log.txt") or die $!;
print $fh utf8::is_utf8($lastname) ? 'utf8 flagged,' : 'not utf8 flagg
print $fh $lastname;
Some string (in this case LDAP)
| <--- here LDAP returns what? is important information
Do you see the manual of LDAP module has 'encoding' or 'binmode' section for this information?
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