Usernames and Student Identification Numbers are not district-specific. Each username must be unique to each student in the Imagine Math system. If you are receiving the error message "Username has already been taken" this means this username is already in use through the Imagine Math system and a different username is required for the student.
If you are attempting to use the Student ID number (or something similar) as a username, and it is already in use within Imagine Math currently, it cannot be used again. We recommend adding the Student ID to another piece of information such as the student's first and last initial or school abbreviations. These additions will help make your student's username unique.
For example, John Smith, student ID 39487603 could be js39487603 or 39487603js; likewise, if your district's name is Example ISD, John's username could be eisd39487603 or 39487603eisd