title: What does it mean "Another object with the same value for property proxyAddresses already exists" during licensing an user in Azure AD?
body: <p>I'm using the Microsoft Graph API versin 1.0 to update a batch of user and for some I receive the following error message:</p>
  
  <pre><code>Another object with the same value for property proxyAddresses already exists.
  </code></pre>
  
  <p>This happens with some few user, but not with many others.</p>
  
  <p>However I don't understand what it means and how to workaround it.</p>
  
  <p>Any ideas?</p>
  
  <h2>Update1:</h2>
  
  <p>This my the JSON payload sent with the request:</p>
  
  <pre><code>{
      "addLicenses":[
       {
           "disabledPlans": [
               "76846ad7-7776-4c40-a281-a386362dd1b9",
               "54fc630f-5a40-48ee-8965-af0503c1386e",
               "c68f8d98-5534-41c8-bf36-22fa496fa792",
               "8c7d2df8-86f0-4902-b2ed-a0458298f3b3",
               "9e700747-8b1d-45e5-ab8d-ef187ceec156",
               "c87f142c-d1e9-4363-8630-aaea9c4d9ae5",
               "b8afc642-032e-4de5-8c0a-507a7bba7e5d",
               "2078e8df-cff6-4290-98cb-5408261a760a"
           ],
           "skuId":"94763226-9b3c-4e75-a931-5c89701abe66"
       }],
       "removeLicenses":[]
  }
  </code></pre>