If login is not possible due to exclusive control
Because SMS uses exclusive control, if there is another user already logged in to the SMS of the same device, then you cannot log in.
Exclusive control message example
If you cannot log in due to exclusive control, you need to ask the other user to log out before you can try again.
Note:
If you close the browser without logging out, the session remains active. In this case, you cannot log in again.
If this problem occurs, you can wait for 5 minutes so that the session is disconnected. Or, you can restart the device to force the session to disconnect.