I only got my S23 4 days ago and already none of the methods for extending unlock - Home Location, Pick-up, and On-body detection, are working.

They all worked for precisely one day and ever since I've had to go back to using my pattern to unlock (or face or fingerprint, which doesn't always work either)

I tried using a fix I found in the forums - reset Wireless and Bluetooth Settings, but that didn't work.

I had the exact same problem with my S21 that I traded in for this one, so it's obviously not specific to my phone.