Hi, @Richard Lehmann
I checked Microsoft's current known issues for the recent Windows 10 updates. There is currently no listed known issue causing printers to disappear or stop printing after the September 2026 update.
Since the scanner still works but the HP OfficeJet Pro 9015 has disappeared from the printer list, this may be a printer driver or Windows print configuration issue after the update.
First, please go to Settings > Devices > Printers & scanners and select "Add a printer or scanner" to see if Windows detects the HP printer again.
Microsoft's printer troubleshooting steps are here:
https://support.microsoft.com/windows/hardware/printer/fix-printer-connection-and-printing-problems-in-windows
If the issue still persists, to help narrow down the issue:
- Is the printer connected by USB or Wi-Fi/network?
- Press Windows key + R, type winver and press Enter. What version and OS build does it show?
- Go to Settings > Update & Security > Windows Update > View update history. What is the most recent KB update installed just before the printer disappeared?
Click "Add comment" to let me know.
Thanks!