Invalid Token with TCAPI plugin and Storyline

I am trying to get the Tin Can API SCORM Mod and the TCAPI plugin to work with Moodle, but am having no luck past a certain point.

I set up a Moodle site using ver. 2.6.5. I then followed all of the
instructions on adding both the TCAPI local plugin and the Tin Can SCORM
mod including turning on web services and the REST protocol. After the
initial setup was complete, I uploaded my TinCan enabled Storyline
course as a SCORM package and tried to run it.

When I try to run a course I get a "Cannot connect to server." message.
If I click cancel from that dialogue the first slide of the course
loads, but flash gives me a"Unable to connect to the server.
Please verify you can connect to the internet and relaunch the course.
Status Code: 400" error.
(I am still connected to the internet and logged into Moodle at this point.)

When I try to diagnose this issue by using the console in Chrome I see
two errors:

Failed to load resource: the server responded with a status of 400 (Bad
Request)
mysite/local/tcapi/endpoint.php/activities/state?method=GET

Failed to load resource: the server responded with a status of 400 (Bad
Request)
mysite/local/tcapi/endpoint.php/statements/?method=PUT

If I click either of the links in question with the Bad Request I see this:

{"exception":"moodle_exception","errorcode":"invalidtoken","message":"Invalid token - token not found"}

I made sure that the user which I'm using to test this has
authentication tokens for both the TCAPI plugin and for Mobile web services.

Can someone please point me to what I may be doing wrong and how to fix it?