How can I test my Actions Builder project on an Android device (for example on my mobile phone)?
Can I publish my project and assign it to a device or a Google account? How I am able to use this Google Assistant project from this Google account?
In the Actions Builder console, once you go to the "Test" tab, you will be able to invoke the Action on any Google Assistant device that is using the same account. If you've given the Action a name already, you can invoke it with "Hey Google, talk to name of action." If you haven't given it a name, you'd use "Hey Google, talk to my test app."
The test page gives you details, just in case.
If you need to use a different account to test with, you can publish to the Alpha channel. With this:
To begin an Alpha release