For me, since the latest Tizen update to my Watch, the App is once again not working as of today, 30th March 2021. But let me clarify - it's not a Security or Authentication issue... the app is still "there" and fires up on double press of my home button as I have configured it...
...My problem is that if I ask it a question, such as "How is the weather today?" the watch begins to reply "Currently in xyz it is..." and then cuts off at that point and locks up (the app, not the watch entirely).
That said - I just downloaded G-Voice Assist to try that out instead - and found that *on certain occasions* (but not always), it too does the same thing too - if i ask the weather, it starts to reply, but stops half way through the response back, and locks up the app.
So it maybe points to a Tizen change issue, rather than an app error, if it happens in two different apps perhaps?