Unable to access voice commands without unlocking ph

[Members_4ad2yae]

Recently my ph no longer let's me make a call via voice command without having to unlock ph first. When driving I am not allowed to touch ph so if on a long Dr I can't make a call without pulling over legally. I used to be able to just say OK Google call _____. 

[Troubadour]

Setting may have changed, check this link, advise if this is not the solution
https://support.google.com/assistant/answer/9134021?hl=en