I tried both of these processes, including unlinking, getting the bridge to start flashing by holding the back button, and then re-linking, but it still doesn’t work. Same thing, it says it’s discovering devices and they were added but the lights don’t show up.
Could you try deleting a light switch from your device then adding it to see if alarm.com picks it up.
If that doesn’t work, final thing I would try would be to factory default the Lutron hub and learn in all the devices again.