SAP consultant cant see client 000 on service connection

Hello all,

I need to SAP consultant logon clien 000 on sap installation, We had create user and password. But he can not see clien 000 on service connection.

"no client 000" as I don't see this client in drop down list when trying to connect.

Any idea how can I add this client on SAP service connection drop Down list.

Thanks

Reza