Review of members

How do you review members of SonarCloud organizations when no email addresses on users are available in the SonarCloud UI?

We are not on Enterprise plan and have users from both BitBucket and GitLab. I only want users from our own email domains, but I find it impossible to enforce because in the SonarCloud UI I can only see the users BitBucket/GitLab user, not their email address.

Am I missing something elementary? Or do you have any good ideas for how to achieve control?