The QA team initially attempted to reproduce the issue on a device running the February build of Android 16, but were unable to reproduce it. After updating to the latest March Android 16 build, the issue was successfully reproduced on Firefox 148.0.1 on Google Pixel 9 Pro and Google Pixel 10 Pro devices. Confirming that the login fails on both google.com and https://www.passkeys.io/ It is worth mentioning that the issue was not reproduced on the Google Pixel 10 with the latest Android version, suggesting that only the Pro models may be affected. We're going to fix it in the next release.