hi,
in our forum, there is no button for inviting users in user profile page or topic pages (even for TL2 users and above) .
this button is only visible to admins and moderators.
I couldn’t find any setting to tune this in admin panel.
in our forum the “must approve user” is active. is it the reason for invisibility of invite button?
Yes, if you have approvals on, users won’t be able to send invites, because they would bypass approval.
Thanks for the answer.
Is there any way to keep the forum somehow closed, meanwhile let trusted users to increase users?
I mean, I’d rather the growth in our forum happen based on the community who has been already formed. does anyone have any suggestion for it?
Does disabling approval, but enabling invite only suit your use case?
It was already the case 
then we needed another tool which enable strangers to ask for an invitation if they fit the community! and we switch to the current setting.
Is it possible to have the invite button even if newbie approval is active? I mean as a feature-request in the app.
as the invite button is only active for TL2 and more, and so it’s somehow like approval by trusted users of the community.
it seems that even inviting existing users to topics and messages is gone for other users.
and this make it little bit hard, is it possible to at least have the inviting function for existing users, in this case?
Olá!
Gostaríamos muito de ter o recurso de convite para usuários, mesmo mantendo a validação de novos usuários ativada. Saber qual usuário existente indicou o novo usuário à plataforma seria uma informação valiosa para o processo de validação.
Isso não é possível no momento, correto?
Podemos ter validação ou convite, mas não ambos?
Acredito que isso esteja correto, sim, mas consigo ver a possibilidade de unificar isso no fluxo de aprovação… Sei que o @sam está planejando algum trabalho com códigos de convite e talvez isso possa ser agrupado? 
Este comportamento foi alterado desde então. É possível que membros regulares convidem outros mesmo quando a aprovação de novos usuários é necessária, sem contornar o processo de aprovação.