Amazon echo control binding - Bad Request

[H102 (CM6.5 H102)]

The configuration looks good so you can try to filter the logs if everything is working.

openHAB - Filtering event logs

Simple string filtering on the event log. Useful for filtering out high change items that don’t need constant log visibility. Re-posting this as it’s own thread on the recommendation of other members. I also recommend reading Taming openHAB 2 Logging and Log4j2 Sample Config which this was based on. Log configuration data using openhabian-pi is stored in the following file. Location may vary under other installation methods. /srv/openhab2-userdata/etc/org.ops4j.pax.logging.cfg openHAB using …

Not sure what binding version your using but you can try the latest snapshot found here.
https://openhab.jfrog.io/openhab/libs-pullrequest-local/org/openhab/addons/bundles/org.openhab.binding.amazonechocontrol/2.5.6-SNAPSHOT/

Uninstall the binding via PaperUI, then place the jar file in /usr/share/openhab2/addons and restart OH.