I am trying to retrieve all the Business Units using the below SOAP request as mentioned in the post: List of OYBAccountIDs and Business Unit Names
<soapenv:Body>
<RetrieveRequestMsg xmlns="http://exacttarget.com/wsdl/partnerAPI">
<RetrieveRequest>
<ObjectType>BusinessUnit</ObjectType>
<Properties>ID</Properties>
<Properties>Name</Properties>
<QueryAllAccounts>true</QueryAllAccounts>
</RetrieveRequest>
</RetrieveRequestMsg>
</soapenv:Body>
But i am getting the response as "Error: API Permission Failed.". Is there any permission that we need to give for the API User? Please suggest.