Why can’t I see my QIAcube Connect instrument in the QIAcube Connect App?
FAQ ID - 1414518

For data exchange, make sure that QIAcube Connect and the Q-Base tablet are connected to the same network. Make sure the IP address of Q-Base has been entered into the configuration dialog of QIAcube Connect, and that communication has been enabled. 
For details see the quick-start guide for Q-Base here.