App Action not running with App Actions Test Tool

I'm trying to run the sample App Actions Fitness project but I can't get the AATT to execute any actions on my Samsung S8 device (or Emulator Pixel 3 with Android 10 & Google Assistant). I've tried with AATT versions (3.1.1 & 3.1.2).

These are the steps i followed:

1. Uploaded a signed draft application to my internal test track Google Play Store account without actions.xml in the AndroidManifest file.
2. Installed the signed application with actions.xml in the manifest onto my device
3. I'm running the latest version of the Assistant and the Google App
4. I made sure the Assistant is properly setup
5. I logged into my Google Play Store account, device/Assistant and Android Studio using the same account.
6. Created a preview successfully using the AATT using Fit Actions as my invocation name and left the Locale blank.
7. When i Run the AATT the Assistant is launched on the device but says, Sorry, I couldn't find it

I even tried to verify my setup using the suggested steps by @adamkoch on Stack Overflow and that didn't work.

I searched the adb logcat for the exact Intent that Assistant is trying to call but only found this:

I/ActivityManager: START u0 {act=android.intent.action.VIEW typ=null flg=0x10000000 cmp=ComponentInfo{com.google.android.googlequicksearchbox/com.google.android.apps.gsa.deeplink.DeeplinkActivityEntrypoint}} from uid 2000

Any thoughts and suggestions would be welcome.

As per the comments, everything was verified and looked good as per this post. The one thing missing on the Samsung Galaxy S8 was to check/set the device locale - the safest bet is to set to en-US.

App Actions is supported in other locales (but en-US is always a safe bet to verify your test setup).

Testing App Actions previews on the emulator is not currently supported which is why it only worked on the physical device (mentioned in the limitations section).