Professional or Academic MATLAB licenses
This error indicates that an end user has already been assigned to the license. Only one end user may be on an Individual or Designated Computer license.
If an end user has been added to the license in error, contact the license Administrator to have the user removed. If you are the Administrator of the license, instructions for removing an end user can be found here:
MATLAB Student and MATLAB Home
MATLAB Student and MATLAB Home licenses are single-user and non-transferrable. It is not possible to change the end user on a MATLAB Student or MATLAB Home license. If you are seeing this error when attempting to activate MATLAB Student or MATLAB Home, please contact MathWorks support: