Yoosee account prohibit the same account login from two different devices at a time. This helps protect your account.
To solve this:
1. Logon your old/existing yoosee account (which your camera had been bind) to create shared link.
(https://support.yooseecamera.com/threads/275/)
2. Register another account to login CMSClient.
3. Add your existing online camera to CMSClient by using shared link.
