How to get there: Go to Settings → Security & Privacy.
You can require admin approval for all users before they can enter.
Go to Settings → Security & Privacy and enable User acceptance.
Optionally, you can automatically allow users from a particular domain, for example, your business email domain.



If you missed the email, or just want to work through pending users from the app, go to Users in the top menu. The Accepted column shows a clock icon for anyone still waiting on approval. Click the user's row to open the edit sidebar and hit the green checkmark button next to the Pending Approval status. That approves them and sends the "you can now log in" email in one step.

After the admin accepts, the user gets the below email so they know they can enter.
