Tincan/xAPI is supported as a publish option “xAPI”. Are you using this publishing option when generating the content for your LMS/LRS? That publish sets up the tincan.xml file which is used to load activity data, etc.
If you don’t see xAPI as a publish type, go into the organization settings on the Lectora Online dashboard and enable it as a publish option.
If this is not working for you please let me know the name of your organization in Lectora Online and the title you are publishing along with your publish options.