Apple requires that we show their social sign-in button prominently: Buttons - Sign in with Apple - Human Interface Guidelines - Apple Developer
From what I checked on this topic(Can I specify order in which the social provider buttons appear?), it is not possible to change the order of the social sign-in buttons.
The problem is that we had one of our Apple apps refused in the Apple Store because the button wasn’t the first (on top) of the social sign-in buttons.
I would like to know if there is any way to solve this issue using the new universal login, otherwise, we have the risk to have our app refused in the apple store again =(