Hi @user72796. I was able to find this post where another neighbor had a similar concern. There is a marked solution with steps to try and what to do if those steps do not work.

Carriers (DPD) are using blocking devices to block doorbell recordings of them delivering.
Proof, when delivery arrived this morning, he didn’t press the bell and when I checked for the recording there was nothing, 5 minutes after his departure I went out to check the door bell and everything is working fine.
My worry is if burglars get hold of this blocking device, the system is useless!!

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