The Platforms page is where you configure the platforms associated with your app, and get status updates on any platforms that may have issues.
Some platforms (such as iOS) use certificates that may expire, or may encounter other errors. You can learn more about these issues in Troubleshooting. These warnings and errors will appear with instructions on the right hand side of the platforms page:
Sometimes, this page may show configuration notes on the sidebar associated with a platform, such as mismatched users or bundle id. You can learn more about these in Troubleshooting.