No ST "things" recognised any longer

Hi, I was advised to delete and rebuild my smartapps and routines to see if it solved the inconsistencies in the hub powering things on and off when it was meant to. I did this and also did a hard reset of the hub. Now it won’t recognise ANY of the Things that came with the starter pack. I’ve reset them all as instructed . 3rd party dimmers are still recognised. Anyone know how to fix this?