Unlock iPhone with Siri

[Susja]

i have iPhone X with the latest version update.
I control it mostly via my headphones Bose using Siri.
Often I want to open some applications but it failed saying 'you need to unlock you phone first'.
I noticed a lot of articles about this issue and they say that one should enable Allow open app on locked screen in Settings.
I verified that it’s enabled in my case.
Question:
What else could prevent Siri to open app on locked screen?
Thanks

 

[Susja]

As far as I could understand it sounds that in my case when I request my headphones Bose to open Google Assitant it failed because Apple does not like it?

Opposite when I ask Siri to play music it would play because it would use Apple Music app?

Do you think it’s the case?

Thanks