Don’t see my iCloud photos in the iPhone photos app

I logged in with my iCloud account on a new phone but all my stored photos in iCloud are not appearing in the photos app on the iPhone. I have plenty of space in my iPhone though. I can’t even browse them in the photo app, there’s just nothing! But in the iCloud settings there are about some gigabytes of photos.

P. S: I lost my former phone and marked it “lost iPhone” in the Find My service , I’m using the same iCloud account. (If that would be some useful details in solving the problem)