You are using the academic version of thingworx which is only provided for the demonstration purpose, in this version you cannot bind the key to Administrator as Thingworx gives only you a User.
Instead of this you can use the Hosted Server trial (30 days) or the local Server Trial (90 days) in these versions of Thingworx you can able to bind your Application key to the Administrator.
You can find this below,
Hope this will solve your problem.
- Saurav Kukkar