title: How to use importValue and join in Cloudformation
body: <p>I have a stack which depends on a value which is exported in a different stack (value is <code>supertest</code>)</p>
  
  <p>I try to use it as below</p>
  
  <pre><code>OriginAccessIdentity: !Join [ "", [ "origin-access-identity/cloudfront/", !ImportValue: !Sub "supertest-${Environment}" ] ]
  </code></pre>
  
  <p>But I got a syntax error while this works (hardcoding the supertest value)</p>
  
  <pre><code>OriginAccessIdentity: !Join [ "", [ "origin-access-identity/cloudfront/", "lol-dev" ] ]
  </code></pre>