Problem adding RuuviTag BLE to Hassio on Pi 4

I am trying to add a RuuviTag to my Hassio instance so I can monitor temperature.
I am running Hassio on a RPi4.
The bluetooth integration is added in Integrations.

The guide to the the RuuviTag BLE integration guide is here

It says
" The RuuviTag BLE integration will automatically discover devices once the Bluetoothintegration is enabled and functional.

If your RuuviTags are not discovered, please make sure to update them to the latest firmware."

I can see the Bluetooth integration is there and the firmware on my tag is up to date.

When I go to add the RuuviTag BLE integration, I immediately get a message saying “No devices found on the network.”

What am I doing wrong please?