Suggest to limit external invitation to only admins.

Currently, Asana team members are able to invite either external guests or they can invite new members with the same email domain but incorrect first/last name. This recreates multiple available members in the workspace.

Hi @Rosalle,

This currently is possible (or will soon be, when it rolls out to your instance) with Role Based Access Control

For this you will currently need either Enterprise+ or teh permissions management add-on.

Also see:

Thanks! Seems applicable for our use case!