My echo / echo show doesn't work as a door bell

Hey all, today I have installed my forst ring (wired). it works fine: I can see someone on my mobile phone, etc. To set my other alexa devices (e.g. echo, echo show5) as a door bell, I have installed the ring skill in alexa and connect both with each other (alex skill ring). Now I can say "show me the doorbell" and I see want I want to see. But it doen't work, that the echos work as a door bell. The communication is activate in each echo and there is no "DND" / Sleep mode. I Tried to deinstall the skill, but there is no better resut. Do you have an idee? Thanks in advance. greeting from Germany