You need to dereference the hash:

%hash = (
  key1 => {
    subkey1 => 'value1',
    subkey2 => 'value2',
    subkey3 => 'Ovid'
  } );
  
print scalar keys %{$hash{ key1 }};

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Cheers,
Ovid

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In reply to (Ovid) Re: scalar subkeys %hash ? by Ovid
in thread scalar subkeys %hash ? by crazysniffable

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