When a student signs in to Symphony Math, the program assigns a unique token, or string, that accompanies all of their communications with the Symphony Learning API (data saving and retrieval). Any calls the student makes must have this token, or the call will not be accepted.
In cases where there are multiple sign ins (from the same computer in another browser tab, or on another device) in the same period of time, an error message may be shown to one of the logins:
"Authentication not correct: -10"
Unique tokens prevent the inadvertent use of the same student account on multiple machines. If the error message occurs, be sure to sign out or exit all open instances of the Symphony Math program where the student is signed in. Each new sign in will generate a new token, and allow student use on that device.