Paywall present even though a user with a given apple account already made a purchase

Hello,

I am testing purchases in a sandbox environment and I don’t understand one thing (is this expected behavior ?) this is IOS app written in swift, using firebase for authentication
step1: A new user opens the app and chooses to sign in via Apple account (provided by firebase auth)
step2: They are presented with a paywall, they make the purchase and continue using the service.
step3: They press “logout” which triggers firebase auth sign out and

1
2Purchases.shared.logOut { custInfo, err in
3                if let err = err {
4                    print("Error while logging out revenuecat: \(err.localizedDescription)")
5                } else {
6                    print("Log out successful from revcat and firebase")
7                    completion(nil)
8                }
9            }

step4: The user logs in again via the same apple account
step5: The user is presented with a paywall again, even though the purchase was already made for this account.

I am setting the user’s ID after logging in to the firebase’s UID one:

1
2   Auth.auth().addStateDidChangeListener() { auth, user in
3            if user != nil {
4                self.signedIn = true
5                Purchases.shared.logIn(user!.uid) { customerInfo, created, error in
6                    if let error = error {
7                        print("error occured: \(error.localizedDescription)")
8                    }
9                    print("created successful: \(created)")
10                    print("Logged in to revenuecat with userId successful")
11                }
12                print("Auth state changed, is signed in")
13            } else {
14                self.signedIn = false
15                print("Auth state changed, is signed out")
16            }
17        }

Is this intended behavior?