OAUTH - USER_PERMISSION_DENIED

[Gopi]

We have 3 MCC accounts and multiple account under each MCC account. So i 
generated client id and client secret for 3 MCC accounts. 2 accounts are 
going through fine. I am facing this with one of the account. I am not sure 
what went wrong, i am using the correct, will someone be able to help me 
looking at the request id.

MCC1
  -   AdWords1
MCC2
  -   AdWords2
MCC3
  -   AdWords3

I am passing the AdWords3 id for clientcustomerid, is that correct ?

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
    <soap:Header>
        <ns2:ResponseHeader 
xmlns:ns2="https://adwords.google.com/api/adwords/ch/v201309"; 
xmlns="https://adwords.google.com/api/adwords/cm/v201309";>
            <requestId>0004fb7f20af37d80a44954aa00062b2</requestId>
            <serviceName>CustomerSyncService</serviceName>
            <methodName>get</methodName>
            <operations>0</operations>
            <responseTime>45</responseTime>
        </ns2:ResponseHeader>
    </soap:Header>
    <soap:Body>
        <soap:Fault>
            <faultcode>soap:Server</faultcode>
            <faultstring>[AuthorizationError.USER_PERMISSION_DENIED @ ; 
trigger:'&lt;null&gt;']</faultstring>
            <detail>
                <ns2:ApiExceptionFault 
xmlns="https://adwords.google.com/api/adwords/cm/v201309"; 
xmlns:ns2="https://adwords.google.com/api/adwords/ch/v201309";>
                    <message>[AuthorizationError.USER_PERMISSION_DENIED @ ; 
trigger:'&lt;null&gt;']</message>
                    
<ApplicationException.Type>ApiException</ApplicationException.Type>
                    <errors 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="AuthorizationError">
                        <fieldPath/>
                        <trigger>&lt;null&gt;</trigger>
                        
<errorString>AuthorizationError.USER_PERMISSION_DENIED</errorString>
                        <ApiError.Type>AuthorizationError</ApiError.Type>
                        <reason>USER_PERMISSION_DENIED</reason>
                    </errors>
                </ns2:ApiExceptionFault>
            </detail>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>

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