problem with my C220 CDI

hi, i have mercedes c220 cdi 2019, it has developed alarm/siren/beep sound from outside of the front passenger seat.there is not any message on display screen.Doors are working properly (lock and unlock).This is only happens when i lock the car and same time this beeping sound starts.No matter whatever you do it doesn't go away till 5mins. As long as you hit the locking key button from fob starts the beep. please help..i will really appreciate the advice. Thanks

hi,
i have mercedes c220 cdi 2019, it has developed alarm/siren/beep sound from outside of the front passenger seat.there is not any message on display screen.Doors are working properly (lock and unlock).This is only happens when i lock the car and same time this beeping sound starts.No matter whatever you do it doesn't go away till 5mins. As long as you hit the locking key button from fob starts the beep.
please help..i will really appreciate the advice.
Thanks

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