C8 Migration Hue Motion Sensors not working [Solved] (hub replacement)

Look at this post:

Reset/re-join from the device is not likely to not solve the issues from that.

Same 'remedy' as on C-8 is required to get the device working: rejoin it through a router, in which case 'Add Device' produces the expected 'previously found' and it works normally, or delete it from the database, reset/rejoin, and fix whatever automations used it.