C1 scale not connecting to iPhone

I’ve upgraded to the iPhone 17 (from 11), but I can’t get the scales to connect. It does show up in bluetooth connections, but it doesn’t actually connect.

Do I need to add the scale again? I did have a quick look, but then I think I would lose all my data.

Can someone please clarify this? I have several years worth of data which I prefer not to lose.

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