Can you provide step for create new client on the AWI?
Open the AWI with client 0 with the UC user.
Then go to the administration tab / client
1/ Add a new client number
2/ Create a new user
3/ Right click on your new user then "move user" to your new client
4/ Go back to client section, and do a right click / activate on your new client.
Then you should be able to login to your new client with your new login.