Hi Fabien Leveque,
Thank you for reaching Microsoft Community.
Surface Hub 2s is supported by our Commercial/Business Team. I'm sorry but we are not train for the Surface Hub here in the Community. I recommend that you contact our live commercial team for assistance on this. You may use the number listed in Global Customer Service phone numbers (microsoft.com) or you may also do it through this page: Support for business (microsoft.com) and create a support request.
Kind regards,
Marrion