Before we get ahead of ourselves, here's how the feature will work. Starting today, the company will be rolling out updates over the air that push the Huawei Alexa app to Mate 9 owners in the US (those in other countries will have to wait, although it's not clear how long). You'll have to install that update as well as Amazon's own Alexa app to use the tool, as that's where your Amazon account information lives. Then, whenever you want Alexa to, say, help you order a new book or turn on your lights, you have to open the Huawei Alexa app and tap the round microphone button or say "Alexa" before speaking.
In a statement, Huawei described Alexa as a "primarily voice-driven experience, ideal for people on the go," so the lack of hotword support is confusing, if not frustrating. It's not as if Huawei wasn't able to create hotword shortcuts for its own "Okay Emy" tool in the past. The company said this is the way Alexa works "currently," although it did not say if that will change in the future.
Huawei's execution of an otherwise exciting feature is flawed, but having Alexa on your phone is still handy, considering the assistant's prowess at controlling smart home appliances and shopping. If you're disappointed with this news and want an alternative means of getting Alexa on a mobile device, there are also Alexa-powered smartwatches to consider.
Update: This article previously stated that you have to open the Huawei Alexa app, then tap the round microphone button before you can talk to the assistant. It has been corrected to reflect that you can also say "Alexa" after launching Huawei's app instead of pressing the button, too.