Check if user or email alredy exist

Hello community,

Today i tried put in my app a block to check if user or email exists, but, i failed in try it.
I need get all tag with firebase bucket and compair to text box while user signup or after click in signup button, and if exist show error mensage “user alredy exist”.

My bucket in firebase:

image

Before registering a user. First get all the tags and see if the user is there?

I tried it:

cpf= doc id of each user.

But i don’t has any result with block…

for text changed also use if is in list ( cp text) list (global all cpf)

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