We got the following problem:
When a customer of ours created a ticket, he can share it with an email adress of his choice. So far, so good.
This email adress now gets a message with an invitation to our Service Desk (project). By clicking the link, they can set up an account and then create tickets for us, even if we never added them to the project.
We want to prevent external users from using our project. Is there a way to avoid that external users can create an account on our Service Desk Entity w/o our knowledge?