ACS commons/Marketo + AEM integration: Marketo form not displaying in publisher/dispatcher

Any ideas why I cannot see the marketo form in the publisher but it's showing up in author.

1. In both author and publisher, I have configured the Marketo settings. (in both cases, the settings is stored in this path: /conf/myapp/settings/cloudconfigs/Marketo)

2. I looked around and found this piece of code: <sly data-sly-use.configMgr="com.adobe.acs.commons.marketo.MarketoClientConfigurationManager" data-sly-use.marketoForm="com.adobe.acs.commons.marketo.MarketoForm">
   
   In author, ${configMgr} is not null while in the publisher, it is null.

3. In both author and publisher, I have AEM 6.5.6 + ACS commons 4.8.6.

Thanks for reading!