1. Hello team, while i was checking on the nakama dashboard as an Administrator i noticed that we can bypass the existing verification and create multiple user with same email id

Steps to reproduce:

1. Open the dashboard as an adminuser and go to the user management form http://site.com/#/users
2. Create a user and capture the request with burpsuite and send that request to repeater
3. when we try to create a user with existing email id, the server will throw error like:

{"code":9,"message":"Username or Email already exists","details":[]}

4. So we can bypass this validation and create new user with same email id by adding space in the email parameter like:

{"username":"user1","email":"test@test.com","password":"Password@123","role":3,"newsletter_subscription":false}

5. In this case we have created user1 with email id test@test.com and we are able to create user2 with the same email id by adding space in the email parameter like this👇:

{"username":"user2","email":" test@test.com","password":"Password@123","role":3,"newsletter_subscription":false}

6. For another user with the same EmailID need to add an extra space like this, for each time add extra spaces:

Impact

1. Due to this existing security mechanism bypass the owner can create multiple users via the same email id, and it can lead to business logic risk
2. If an attacker has access to the admin user then the attacker can create users with the same email id