I somehow got the courage to try it.
So, my phone has been telling me that I have to approve it from another device and at one point it even said that it will shut down my account forever if I don't do it. So after reading and reading I hoped and prayed that it wouldnt mess anything up.
So once you go into settings you click the uhhhh... IDK what exactly you push but when you get into settings you'll know what to push😂 So you click it and you do your passwords and pass codes and everything then you get to a screen where it says accept from another device, or something along those lines. If you are absolutely un able to do this, wether it be your not getting the message on you old device or you don't have it at all, you have two other options. Click cancel or the button to the unknown. If you decide to click cancel it will bring you back to settings. If click Resest Protected Data you will be brought to another screen wich say something like, "Are you sure you want to do this. This will reset passwords, home , and any other protected data." I really wish it was more specific. So when I clicked Reset Protected Data from there I saw a spinning wheel and I waited. For ME PERSONALY I didn't loose anything. I still have my pictures, I still have my contacts, and everything else is the exact same as before I did it. As for what you'll experience, I have no idea. So my advice is if you have important things on your phone don't try it. Go to the Apple Store and see what they can do to remove that annoying icon. They will be able to tell you more then what I can