AuthorizationError.USER_PERMISSION_DENIED on live account

I received an email this morning with the message my AdWords API token was approved for Basic Access. If I however try to access the ManagedCustomerService I get a response from the API that shows:

AuthorizationError.USER_PERMISSION_DENIED on live account

The same logic is working on the test account. My request_info.log file lists:

[Oct 25 2016 15:38:03.000000 - INFO] effectiveUser=xxx-xxx-xxxx service=ManagedCustomerService method=get operators={} responseTime=207 requestId=00053fb0e54c3cb10ac2f0a32d0d8612 operations=1 units= server=adwords.google.com isFault=false faultMessage=null
[Oct 25 2016 15:38:43.000000 - ERROR] effectiveUser=yyy-yyy-yyyy service=ManagedCustomerService method=get operators={} responseTime=276 requestId=00053fb0e77f49510ac25102fb091f36 operations=1 units= server=adwords.google.com isFault=true faultMessage=[AuthorizationError.USER_PERMISSION_DENIED @ ; trigger:'<null>']

the soap_xml.log file shows the 2 requests and response with the test and live account. In both cases I use the developertoken listed in the associated AdWords API center.

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