iPhone sync hangs at "Preparing to sync".

I have a 13 Pro (iOS 17.2) that I'm trying to sync with a mini M2 (OS 14.2). This was working until the end of Nov. 2023. I have tried rebooting both devices, and deleting all folders in the MobileSync folder. When the Iphone is connected, it will create a backup, then never get past "Preparing To Sync". I have given them an hour to move on to syncing, but have had no success. I am using an Apple cable that is connected directly to both devices, there is no hub involved.