[Matter] Device cannot be commissioned to Google Home through iOS

Hi,

We are facing the issue of commissioning our Matter device to google home through iOS device will be 100% failed.

Here is our test summary regarding the issue:

• TestCase1 [OK]: Commissioning our Matter 1.4.0 device to Google Nest Hub 2 by Android device (see log

• TestCase2 [NG]: Commissioning Matter 1.4.0 device to Google Nest Hub 2 by iPhone13 or iPhone16 (see log

• TestCase3 [OK]: Commissioning our Matter 1.3.0 device to Google Nest Hub 2 by iPhone13

In TestCase2, we noticed that device was first commissioned to iOS(Apple keychain) then iOS opened a commissioning window again to commission it in Google’s ecosystem, and the device was failed at above step 2, so we also tried:

1. Commissioning the device to Apple Home works as expected, next share the device to Google Home app on iOS, this also fails.
2. Commissioning the device to Apple Home works as expected, next share the device to Google Home app on Android, this works as expected and device pops up in Google home of iOS as well.

Could you help check what's the issue of TestCase2?

Append the environment of our testing:

• NestHub 2 version

• Google Home app version