@Marie Oh, i think i get it, but i have to check so where i configure my domain… cause uintil now, only me is using mail@mycompany.fr … all other members (dev & clients) are using their own emails
And again @Joris there is nothing better than a good old test, so don’t hesitate to create two accounts for yourself and test.
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As long as your clients and dev don’t use an @mycompany.fr email address, you should be all good to go!
By the way, our Community Forum is also available in French 
In fact both @Bastien_Siebman and I are native French speakers, so if you’d like to get help or share yoru experience with Asana in French, feel free to post in Forum de la Communauté French - Asana Community Forum!
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@Marie great I ll do
But don’t put them as Team members or Project members, because if you do they will see each other. Correct @Marie?
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@Bastien_Siebman indeed. I just made a screen share with one developer and i notice that he is able to see every members.
So my question now is how i can give acess to a project or task to someone without beeing a team member or project member ? Just by giving URL link ?!
I am confused there.
I have just test to give link to one asana user outside of any project or team member.
When he click on the link he got this error
Based on this i don’t understand how a user can have access to task or project without beeing a team member 
You can add them as collaborators of the task only. They will see the task(s) but not the rest.
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Correct @Bastien_Siebman
Sorry for late reply.
I’m a bit lost, ill go create a post in french forum so
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I made french post on this link with video : Empêcher des utilisateurs de se voir/contacter
Thanks