Pour information, voici la réponse que j'ai obtenue par Chat avec un agent de l'assistance:
I see, after verification, I would like to inform you that Trend Micro no longer provides free licenses to teachers in accordance with the Ministry's decision. Therefore, we are unable to provide you with new license numbers for the Trend Micro program.
For any further explanation, I strongly recommend that you contact Alain Baclet, the French account manager, directly at the following address: alain_baclet@trendmicro.com