Here are some of the very simple steps that will help you to fix your issues and bring your HP printer offline to online.
Update your printer
Check your printer driver is updated or not.
Click ‘start’ menu and click on ‘settings’
Then Click on ‘devices’ again click on ‘printer and scanners’
Now from the listed printers,
Select and right click on your HP printer
Unchecked the option of “Use Printer Offline”
Check your printer is "Set as default printer"
For more visit
https://www.printeralign.com/hp-printer-is-offline-how-to-get-it-online
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Also Visit :
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https://sites.google.com/view/hpprinterisofline/home
http://sandradrago.booklikes.com/post/3206634/why-does-it-say-my-hp-prin...
https://hpprinteralign.blogspot.com/2020/09/how-do-i-get-my-printer-offl...
http://www.apsense.com/article/how-do-i-get-my-computer-to-go-from-offli...