When the Admin user creates a source subscription with the third party system, an error appears when saving: You have selected a Third Party system. Please adjust the configuration to be a master subscription
The missing step is to go to Advanced Mode and the property (it is false by default) needs to be set as:
To take the following steps:
- Click Advanced Mode on the New Source Subscription page.
- Update the feed.master property to true.
Network Help Documentation: Advanced subscription settings