Hi
Pour une meilleure compréhension, je souhaite répondre à la question en anglais.
As per the description you generated the license file using the license key “668026”, this key might be linked to the parallel computing toolbox only.
As per my understanding you would like to find the license key for the MATLAB. If this is the case, then you can check the license center with the help of the following link.
You will have to login using your registered email ID.
Alternatively, you can run the command “ver” in your MATLAB command window to get the license key.
Hope this will help in resolving the query!