If your HP ePrint is not functioning, several factors might contribute to the issue. First, ensure that your printer is ePrint-enabled and registered with the HP ePrint service. Verify that both your printer and the device sending the print job are connected to the internet. Check for any error messages or notifications on the printer's display panel. Additionally, confirm that the printer's firmware is up-to-date. If problems persist, try restarting both the printer and the device sending the print job.