Andrei

@JedShiMing My solution is: 1. Clone socket.io (https://github.com/rikulo/socket.io-client-dart) to project 2. Clone socket_io_common (https://github.com/rikulo/socket_io_common) to project 3. Add to `pubspec.yaml` msgpack (https://pub.dev/packages/msgpack_dart) 4. Edit `Encoder` and `Decoder` in `socket_io_common ->...

Shortly, it's not library issue. Look like it's incorrect behaviour of Firebase for some phones/browsers. More info here https://github.com/firebase/firebase-js-sdk/issues/4256

@Joseph-Nathan, you can try to use redirect to your server and from your server redirect to app by package name, but i am not sure, may be it useless.

Have same issue on some devices. Main reason: on some devices NFC and Camera can't work at same time. Hardware issue.

@ThexXTURBOXx, i have iPad and i can make some tests if you provide me what exactly need to test.

@ThexXTURBOXx, I finished tests, looks like it work correct, "preferEphemeral" option also work correct. I tested with your example and also I tested with GitHub Oauth2. Screenshots from test with...