Alarm issue Clio GT line TCE auto

Hi, I have a problem with my Clio and have no idea how to resolve. When I lock the car a minute long beep rings out and the only way to stop this is by keeping my car unlocked. I have tried inserting my key card multiple times to disarm the alarm but this has not worked. I have managed to lock all doors bar my boot by locking the car and as the long beep plays pressing the unlock button on my boot. Any suggestions on why this is, and/or how to stop this from happening every time I try and lock my car? TIA!
 

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