That user can't buy signal may be due to the following reasons:
- The copying account is a demo account. At FXCE, users must use a real MT5-FXCE account to buy a signal. See instructions for creating a real MT5-FXCE account here.
- The copying account is a real account but does not have a minimum balance of 1000 USD. See instructions for transferring money from USDT wallet to MT5 account here.
- The account that is chosen to buy signals has not registered to sell signals.