Anyone can access spoke and upload rooms after email verification

[naoki1219aic]

In the hubs cloud I built, Anyone can access spoke and upload rooms after email verification　like pictuure.
This is a huge problem, both in terms of security and server costs.

I see a site that has a custom domain built, but when I try to spoke in to try it out, the email is not returned with an auto-reply.

I want only Hubs cloud admins to be able to upload in spoke.

How can I set this up, is it on the aws side? Or do I need some code?