I cannot connect my bluetooth keyboard in Recovery Mode

I'm following the steps below. I completed Step 5 but didn't see the Bluetooth Setup Assistant. However, I do see these two weird symbols alternating. Help!

Start up your computer in macOS Recovery and pair Bluetooth input devices

Follow these instructions if you need to pair a Bluetooth® keyboard, trackpad, or mouse with your Mac when you start up in macOS Recovery.

1. On your Mac, choose Apple menu  > Shut Down.
2. Wait for your Mac to shut down completely. A Mac is completely shut down when the screen is black and any lights (including in the Touch Bar and keyboard) are off.
3. Press and hold the power button on your Mac until the system volume and the Options button appear.
4. Press the power button three times.
5. Note: Each press of the power button needs to be made within 1 second after the previous press. If you press the power button too fast it won’t register because rapid presses are reserved for other purposes, such as VoiceOver.
6. Use Bluetooth Setup Assistant to pair your Bluetooth accessories with your Mac.
7. Note: You don’t see Bluetooth Setup Assistant if you already have an input device connected.
8. Select an administrator account, then click Next.
9. Enter the password for the administrator account, then click Continue.
10. When the Recovery app appears in the menu bar, you can choose any of the available options in the window or the menu bar.