Having same problem which started a few days ago. Pico not responding in HP.
Cycled Lutron and HP; removed Lutron Caseta app and reinstalled. When adding device, the bridge shows up and HP is in discovery mode, but pressing on the back button of the Lutron bridge doesn’t do anything.
I’ve deleted the bridge on the Lutron phone app and then paired again on that app and there was no problem doing that with 1 push of the button on the back of the Lutron bridge. Still can’t pair to the HP Lutron App with a button push. Any ideas? Thanks.
(see also How do I add existing Lutron Caseta Switches - Questions & Help - Homey Community Forum)