Finding douplicate items in different boards

Dear Community, I have a question that cant find an answer.
I have in my sales team workspace we have several boards that is used from individual sales pipeline from lead to closure.
We wanted to add a notification or something that tell us if a lead is already present in another board. Like if the fiscal code in a text collum is already present in another board get a notification or something.
I tried with the connect+mirror collum but it doesn’t get the job done because you are connecting the items and not the boards.
Thanks to everyone who will stop by and give some possible solution

Hello @Marco.Barbini,

Welcome to the community.

You can use the Duplicates and Uniques app to do that. Here is a demo video demonstrating how.
If you need any help, you can reach out at