Malformed email address error when adding a user

When adding a new user, a "Malformed email address" message is displayed above the email.

An error indicating that the entered email address is malformed.

Cause: There is a space in the email address

Resolve by removing any spaces that surround the email

If you copied the email from another location there could be an extra space either before or after the email. Removing these spaces should resolve this issue.