Error Code Amber flashes in the center with two persistent purple light bars at the outside edges

WPS Push Button mode error.

? What Causes This

Error during Wi-Fi Protected Setup when using push button configuration method.

✓ How to Fix It

Reinitialize WPS by restarting the printer or manually initiating WPS again. Consult network setup documentation for assistance with specific troubleshooting steps.

Source: page 30 of the official manual

From the manual

Manual page 30 — HP error Amber flashes in the center with two persistent purple light bars at the outside edges

This error code appears in:

HP Envy 6400E All-in-One Series Printer