Extend an invitation to link an account with our MCC account (NOT AUTHORIZED ERROR)

[fede]

Hi, I'm trying to extend an invitation to link an account with our MCC 
account using the mutateLink operation, and I'm trying to do this using the 
google-ads-python-lib library.

When I try to send the invitation, I get an error 
ManagedCustomerServiceError.NOT_AUTHORIZED.

We have admin access to MCC.

The request I'm sending looks like this (I will delete the developer token 
and the credentials of the accounts envolved):

<soap-env:Envelope xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/
">
    <soap-env:Header>
        <ns0:RequestHeader xmlns:ns0="
https://adwords.google.com/api/adwords/mcm/v201809";>
            <ns1:developerToken xmlns:ns1="
https://adwords.google.com/api/adwords/cm/v201809";>********
            </ns1:developerToken>
            <ns2:userAgent xmlns:ns2="
https://adwords.google.com/api/adwords/cm/v201809";>Dashbo (AwApi-Python,
                googleads/15.0.2, Python/3.6.3, zeep)
            </ns2:userAgent>
            <ns3:validateOnly xmlns:ns3="
https://adwords.google.com/api/adwords/cm/v201809";>false</ns3:validateOnly>
            <ns4:partialFailure xmlns:ns4="
https://adwords.google.com/api/adwords/cm/v201809
">false</ns4:partialFailure>
        </ns0:RequestHeader>
    </soap-env:Header>
    <soap-env:Body>
        <ns0:mutateLink xmlns:ns0="
https://adwords.google.com/api/adwords/mcm/v201809";>
            <ns0:operations>
                <ns1:operator xmlns:ns1="
https://adwords.google.com/api/adwords/cm/v201809";>ADD</ns1:operator>
                <ns0:operand>
                    
<ns0:managerCustomerId>**********</ns0:managerCustomerId>
                    <ns0:clientCustomerId>**********</ns0:clientCustomerId>
                    <ns0:linkStatus>PENDING</ns0:linkStatus>
                </ns0:operand>
            </ns0:operations>
        </ns0:mutateLink>
    </soap-env:Body>
</soap-env:Envelope>

And this is the response I'm receiving:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
<soap:Header>
    <ResponseHeader xmlns:ns2="
https://adwords.google.com/api/adwords/cm/v201809";
                    xmlns="
https://adwords.google.com/api/adwords/mcm/v201809";>
        <ns2:requestId>00058414095e34100aa33dc4c00f6f46</ns2:requestId>
        <ns2:serviceName>ManagedCustomerService</ns2:serviceName>
        <ns2:methodName>mutateLink</ns2:methodName>
        <ns2:operations>1</ns2:operations>
        <ns2:responseTime>243</ns2:responseTime>
    </ResponseHeader>
</soap:Header>
<soap:Body>
    <soap:Fault>
        <faultcode>soap:Server</faultcode>
        <faultstring>[ManagedCustomerServiceError.NOT_AUTHORIZED @ 
operations[0]]</faultstring>
        <detail>
            <ApiExceptionFault xmlns="
https://adwords.google.com/api/adwords/mcm/v201809";
                               xmlns:ns2="
https://adwords.google.com/api/adwords/cm/v201809";>
                <ns2:message>[ManagedCustomerServiceError.NOT_AUTHORIZED @ 
operations[0]]</ns2:message>
                
<ns2:ApplicationException.Type>ApiException</ns2:ApplicationException.Type>
                <ns2:errors xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance";
                            xsi:type="ManagedCustomerServiceError">
                    <ns2:fieldPath>operations[0]</ns2:fieldPath>
                    <ns2:fieldPathElements>
                        <ns2:field>operations</ns2:field>
                        <ns2:index>0</ns2:index>
                    </ns2:fieldPathElements>
                    <ns2:trigger/>
                    
<ns2:errorString>ManagedCustomerServiceError.NOT_AUTHORIZED</ns2:errorString>
                    
<ns2:ApiError.Type>ManagedCustomerServiceError</ns2:ApiError.Type>
                    <reason>NOT_AUTHORIZED</reason>
                </ns2:errors>
            </ApiExceptionFault>
        </detail>
    </soap:Fault>
</soap:Body>
</soap:Envelope>

I'm not sure of what's happening. Any help will be appreciated.

Thank you!

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