You can make the users access the platform without the invitation. Also, you have the facility to restrict the email addresses with their domains.
Select “Anyone with the following email address domains can join”. Enter the domain address which you like to have the access and enter space. You can add multiple Domain addresses at once.
If the new user tries to access the platform with the email address domain which is not added in the list, then they will receive an error message while they try to signup.
If the user tries to access the platform which is added in the list, they will get access to the platform on the completion of their signup.