The problem exists in the whole product line including Libre 1, Libre 2, Libre 3.
What happens is that the Near Field Communication (NFC) of the iPhone gets turned off by the Libre software if you are using any IOS past 16. The other troublesome side affect of this is that Apple Pay will no longer work by tapping your iPhone since it uses NFC to communicate to the cash register.
This MUST be fixed by the manufacturer, Abbott. Apple does not give you the ability to turn NFC on and off nor does it allow you to revert to earlier operating system releases.
One way to get around this and still use Libre without buying a new phone is to purchase a separate Libre Reader. It is available for the Libre 2 and Libre 3. This is not a good solution, but cheaper that a new iPhone.
I am considering switching to Dexcom G6 glucose monitor if Abbott doesn't get this fixed soon and issue an apology to the thousands of users it has impacted.
M