Operating unique ID

I have a real estate company where we manage vacancies. I manage it by row and different tabs.
(Tab 1 - 1 bedroom apartments and each column has fill in information, Tab 2 - 2 bedroom etcโ€ฆ)
I am trying to generate a Uniqe ID for each property but the automatically generated number seems to be repeating itself.

0 10 1,526
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