Cannot add new team members to the collab spaces. Sponsorship.

Hello,

I submitted a form at the beginning to request the adding of new team members to the 3DEXPERIENCE platform. The members received We received the "Dassault Systèmes 3DEXPERIENCE platform DS Challenges - Sponsorship - USE2" email invitation. 

The problem is that now I cannot add the new members to the collaborative spaces.

Is there something I should do on my end ?

Thank you !
 

Edu Sponsorship