Common issues - hippogamesunity/SimpleSignIn GitHub Wiki

Some web browsers may block deep links by default. We guarantee support for Google Chrome, Safari and Firefox (please refer to Supported browsers section).
For security reasons, Google and other platforms allow OAuth in trusted browsers only. We guarantee support for Google Chrome, Safari and Firefox. Requests from embedded browsers (web views) and emulators may be blocked.
When using deep linking for Windows, Force Single Instance should be enabled in Player Settings.
When using the loopback flow for Editor and Windows (optional), HttpListener is blocking the main thread if Run In Background is unset. To avoid this, set Run In Background in Player Settings.
The App Store review team may reject your app with the reason "poor user experience" if you're using any option other than Sign in with Apple as a primary method. Implement Sign in with Apple as a primary method or implement the functionality to create user accounts inside the app.