I think I may have finally sorted it... I had the smart lock fail to unlock just recently so I went into smart lock in settings and selected trusted places. The location shown in the screenshot below is where my Note 9 thought I was. I'm actually in Glasgow, Scotland. TBF, the phone had only just booted up. The location below translates to latitude 0' longitude 0'. Now there's a thing! I've added this location as a trusted place on the basis that it's safe enough to do so, as the likelihood of my phone finding its way to the middle of the ocean off the coast of Ghana is pretty low risk! Since then, so far, smart lock seems to be behaving itself. Fingers crossed!
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had this problem the whole 2+ years I had my S7 edge. It also doesn't work at all reliably on my Note 9. It seems like biometrics is fighting smart lock and all the other options to auto lock / auto unlock are a confused mess and the poor software doesn't know whether it should be unlocked or not. A better approach for defining a trusted place would be to assume it's a rectangle not a dot... ie enable set up of the boundary by going to the furthest corners of the building in sequence, registering each corner with smart lock as a boundary for the trusted place, until all four places have been noted. Thereafter smart unlock should happen whenever the device is within that boundary. That's how I'd design it to work if I still worked as a software developer.
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