Alexa can't unlock the door

My intercom phone set : (Urmet 1133/15) set to mode 2 wires(1+n) The intercom of my building does not report any state lock/unlock for the door. If you unlock the door then after a delay, automatically the door is locked, nothing more. In this case : — Ring app indicates the state “ready”. — Alexa indicate the state “unlocked” definitively. Now, ask for Alexa to unlock the door. Alexa answers “door is unlocked”. But it is not the case. I wonder if Alexa seeing the door unlock does nothing when you ask for Alexa to unlock the door. Perhaps Alexa after a delay by itself must change the state to “locked”.