Hey @ObiQuiet! The Contact Sensors and Motion detectors should be discoverable by the Alexa. If you try to sync many devices at once, it can sometimes take time before more are detected, but it sounds like you’ve given it ample time. Also, the Flood/ Freeze and Fire sensors are not available for Alexa integration at this time.
Please try the Contact and Motion Sensors again at your earliest convenience, and let us know how it goes.