PlayStation controller: DualSense player indicator blinks a number

You are setting or switching a pairing slot. A DualSense can hold up to four pairings, each in its own slot; while you set one, the light bar and player indicator blink, the player indicator blinks the number of the slot you chose, and it lights steadily once the switch works.

Applies to: DualSense wireless controller (slots for up to four devices). What you see: colour not named by the maker, flashing or blinking. Where: a controller.