HP SureSupply on Android (Samsung Galaxy Note 5) can't find/connect to my HP OfficeJet Pro 8600 Plus printer. Even if I add the printer from catalog the app can't connect to it and obviously can't show ink levels. Same app on IOS, same network / printer configuration works just fine. In other words the problem lies with SureSupply app for android.
Welcome to the HP Forums. I would be happy to help you with your HP OfficeJet Pro 8600 printer. I understand that sure supply mobile app cannot find the printer and you have already done some preliminary troubleshooting.
Don't worry though as I have a few steps to determine the issue and find a solution as well,
Make sure that your printer is connected to a wireless (Wi-Fi) network.
Check to make sure that the mobile device is connected to the same network as the printer.
In the My Printers tab, swipe left or right to see the printers in the list, and then check to make sure that the printer name is listed.
If you cannot detect your printer automatically, try turning off your network router and mobile device, and then turn them back on. If you still don't see your printer in the list, you can also follow these steps to find it manually:
From the HP SureSupply app's My Printers screen, tap Catalog.
In the search bar, type the printer’s model name or model number
Click here and refer the document to perform above steps.