I saw that PR 6404 was merged.
I’ve installed latest snapshot of binding from here:
bundle:update 291 https://openhab.jfrog.io/openhab/libs-pullrequest-local/org/openhab/addons/bundles/org.openhab.binding.amazondashbutton/2.5.0-SNAPSHOT/org.openhab.binding.amazondashbutton-2.5.0-SNAPSHOT.jar
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IT IS RUNNING!
Thank you very much! Well done!