You can try one of these options when you want to add the printer to Windows:
1.On the Windows computer, open Windows Explorer and go to the „Network“ item. There’s an icon for the Raspbeery pi ; open it. There’s an icon for the printer shared from the CUPs. Right-click that one and select „Connect…“.
2.On the Windows computer, select „Add new printer“ then „Connect to a printer on the Internet or network“ and specify the full path of „http://{Playername}:631/printers/{printername}“
For the Android phone: maybe you can try to use another app.