Internal API error with ServicedAccountService v201101

[MT]

I'm getting internal API errors on queries to ServicedAccountService
v201101 that used to work fine. These occur when the authToken is
owned by an MCC (not when authenticating with client accounts). The
request is:

<?xml version='1.0' encoding='utf-8'?>
<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
        <soap:Header>
                <RequestHeader 
xmlns='https://adwords.google.com/api/adwords/mcm/
v201101' xmlns:cm='https://adwords.google.com/api/adwords/cm/v201101'>
                        <cm:authToken>XXX</cm:authToken>
                        <cm:developerToken>XXXX</cm:developerToken>
                        <cm:userAgent>XXXX</cm:userAgent>
                        </RequestHeader>
                </soap:Header>
        <soap:Body>
                <get xmlns='https://adwords.google.com/api/adwords/mcm/v201101'>
                        <selector>
                                <enablePaging>false</enablePaging>
                                </selector>
                        </get>
                </soap:Body>
        </soap:Envelope>




and the response:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
        <soap:Body>
                <soap:Fault>
                        <faultcode>soap:Server</faultcode>
                        
<faultstring>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @
[Ljava.lang.StackTraceElement;@1b45c7a</faultstring>
                        <detail>
                                <ApiExceptionFault 
xmlns="https://adwords.google.com/api/adwords/
mcm/v201101" xmlns:ns2="https://adwords.google.com/api/adwords/cm/
v201101">
                                        
<ns2:message>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @
[Ljava.lang.StackTraceElement;@1b45c7a</ns2:message>
                                        
<ns2:ApplicationException.Type>ApiException</
ns2:ApplicationException.Type>
                                        <ns2:errors 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:type="ns2:InternalApiError">
                                                <ns2:fieldPath></ns2:fieldPath>
                                                <ns2:trigger></ns2:trigger>
                                                
<ns2:errorString>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR</
ns2:errorString>
                                                
<ns2:ApiError.Type>InternalApiError</ns2:ApiError.Type>
                                                
<ns2:reason>UNEXPECTED_INTERNAL_API_ERROR</ns2:reason>
                                                </ns2:errors>
                                        </ApiExceptionFault>
                                </detail>
                        </soap:Fault>
                </soap:Body>
        </soap:Envelope>

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