WatchOS 10 is only compatible with iOS17 and up. Since your SE is still on 9 it's still compatible with iOS 16. WatchOS 10 removed the legacy support for past iOS versions.
this post was submitted on 25 Nov 2023
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Thank you! Is there a way to force update ios 17 on iPhone X?
Nah no longer supported outside of security updates going forward.
There is no support for this. It simply won’t work.
She needs a new phone
That’s a 6 year old phone. Not gonna connect to the new watches. There’s great 2nd hand websites (that check everything like IMEI and loan status as well as Apple account locks) that you could easily get a 12 for $230 USD
If you h ave a newer phone, just switch watches.