title: What am i missing Set-DynamicDistributionGroup
body: <p>I am trying to apply dynamic distribution group recipient filter to take the country into account</p>
  
  <pre><code>Set-DynamicDistributionGroup -identity "HR - Everyone" -RecipientFilter {(CountryCore -eq 191) -and (RecipientType -eq 'UserMailbox') -and (Company -eq "Contoso ltd")}
  </code></pre>
  
  <p>And i get the 'cannot be null' error, but the documentation says that only 'identity' is required, so i'm puzzled by this.</p>
  
  <blockquote>
    <p>Cannot retrieve the dynamic parameters for the cmdlet. You cannot call
    a method on a null-valued expression.
        + CategoryInfo          : InvalidArgument: (:) [Set-DynamicDistributionGroup], ParameterBindingException
        + FullyQualifiedErrorId : GetDynamicParametersException,Set-DynamicDistributionGroup</p>
  </blockquote>