Let's say that you set up your printer as a Cloud printer and now suddenly find it's offline. You make sure it's turned on, but when you go to print, it's still offline.
This is a bug. It happens especially when a printer has not been used for a time.
The solution is to delete the printer and reinstall it
To delete the printer, initiate a print job and click on “change” to display printers and print jobs, then click on “printers”and delete the offending printer.
To reinstall, go to the printer and get the IP number, such as 192.168.1.63
I also use a utility called “fing” to provide me that number from my network without going to the printer.
With the IP number in hand, simply type that number into your browser and re-register your printer.