Cannot pair with my Tacx HR monitor

I have a Tacx HR monitor and Flux 2 trainer. The app sees the trainer ok, but does not see the HR monitor. I am using the free edition and iOS. The HR monitor shows up as connected in my Bluetooth devices. Weirdly the TrainerDay app shows up an Apple Watch as my HR monitor. I don’t own an Apple Watch.

When the Flux 2 connects, there is a box for Heart Rate Monitor which is green, but HR does not show up on the dashboard. I removed this, but my Tacx HR monitor is not found.

Anything I am doing wrong?

I have closed all apps and it is now seeing my HR monitor.

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