@jlongeb: We learnt that this app cannot run on the Splunk cloud search head due to Splunk cloud specific restrictions. Instead Splunk recommended provisioning an Input Data Manager (IDM) [1], which is a managed heavy forwarder and to my understanding is included in you Splunk cloud license. You then install the CB app on the IDM and proceed as documented.
Best of luck. Cheers!
[1] https://docs.splunk.com/Documentation/SplunkCloud/8.0.1/Admin/IntroGDI#Work_with_Inputs_Data_Manager_.28IDM.29
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