Ring Chime - where's the reset hole?!

Hi all, hope you're well. I recently changed WiFi providers and have successfully moved my doorbell and one Chime across. But the other Chime (for the kitchen) just keeps rapidly blinking. Every search I've done suggests using a paperclip for a factory reset and then setting it up again from scratch. But there's no hole. There's a button where the hole is supposed to be and pressing that (while plugged in) for anything between 5 and 30 secs essentially does nothing. I'm sure I'm just being stupid but if anyone can tell me what (blatantly obvious) move I should be making, I'd be very grateful!