I have a similar issue with 3 new HUE Motion Sensors.
I already had a few in place for quite some time, and they still work perfectly.
However adding the 3 new ones keeps failing.
The are found, they connect, but after that the status remains ‘Not reachable’
No matter what I try, and for all 3 of the new ones. Each time they initially connect, but keep status ‘not reachable’.
Phoscon runs in Docker container on Synology v7 NAS, with Conbee II stick.
Version 2.13.01 / 06/10/2021