I found a problem with my cookie, i tested using the dual value in the example on cpan, the data dumper is:

$VAR1 = {
          'password' => '025a38ae929ace0637824f7728da371d',
          'username' => 'barrycarlyon'
        };
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but with font and size, (note speechmarks, and values are on two lines not one)
so I corrected my cookie creation, and will now try your solution again