Osram Smart+ Plug and Mini Switch unlearn?

I’ve an Osram Smart+ Plug and a Mini Switch paired with zigbee2mqtt. I want to use the Mini Switch remote to control anything on my nodered home automation, the plug shall be controlled by nodered scheduler. But whenever I push a button on the remote, the plug reacts on it. I tried to reset both (plug 10s button, remote 10s down+middle, 3s up+middle) - no change.
Any hints what I’m doing wrong? Any further information required for an answer?