I noticed, that Smart Lock does not work on my Nokia 7 plus (still Android Oreo) anymore. Even all settings (Face Unlock etc.) are disappeared within the Smart Lock category of my phones security settings (I still have to enter my PIN in order to access the Smart Lock category).
I haven't received an Android update since mid of August :-( and I remember, that Smart Lock did work definitely a few days ago and I also could access and change the Smart Lock settings without any problems.
Any hints how to get Smart Lock work again?
Yes, that worked. Thanks.
Yes, I had to repeat this method every few days. Very annoying. I'm now on Android Pie and maybe it's stable now - at least it's stable for two days now ;-).