Unable to add anyone to my collaborative spaces


I'm trying to add a few of my team members but I cannot seem to find them in my standard profile. I can find them in the user communities, but I can't find the same people in my CATIA/Engineer role profile. 

I'd appreciate some help. 

Edu ​​​​​​​3DEXPERIENCE ​​​​​​​3DSpace ​​​​​​​