trouble scanning from HP OfficeJet 6600 with macOS Catalina version 10.15.4

[Frustrated117]

Was working fine with version 10.15.3.  Now I keep getting the error "failed to connect to device"  Help!!!!

[TEJ1602]

@Frustrated117, Welcome to HP Support Community!

To be able to assist you better, I would like to know the following:

How is the printer connected to the computer?

Are you able to print fine to the printer?

Meanwhile, follow the steps below-

Update HP Easy Scan: Open HP Easy Scan. On the upper bar, click HP Easy Scan, click Check for Updates, and then install any available updates.

If the above solution did not help, try scanning with another app, such as Apple Image Capture. Refer to the document HP Printers - How to Scan (Mac)  for help.

Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[Frustrated117]

Thanks for getting back to me.  I called Apple support and they had me run a malware scan which indicated that I had adware which was preventing my laptop from properly communicating with the printer. We removed the adware and everything works fine.  There was never anything wrong with the HP printer.

[TEJ1602]

@Frustrated117

That's great! Happy to hear that.

Let me know if you need any further assistance.