I think your issue mirrors a current limitation in the trail functionality:
Since end of September 2018 all new trial instances have a reduced access of ThingWorx:
Reduced ThingWorx access.
In an effort to provide the latest AR content and updated capabilities, PTC is providing simulated IoT data and removing access to the ThingWorx Platform. New customers trial servers will not allow access to ThingWorx composer. PTC now provides sample IoT data for every trial member of simulated examples