How about changing:

my $tee = new IO::Tee(\*STDOUT,
          new IO::File(">>$config::logfile"));
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to (update: fixed typo per reply):

my $fh = IO::File->new(">>$config::logfile") or die "Failed to open $c
+onfig::logfile: $!";
my $tee = IO::Tee->new(\*STDOUT, $fh) or die "Failed to create tee: $!
+";
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