I had the problem the other way round - it wouldn't unlock in trusted places. I solved it on my phone. I switched off every other SMART lock feature and just left Trusted Places on. Been working for over a day now after having not worked at all for 3 or 4 months. Obviously one of the other Smart Lock features - voice, trusted devices or on-body detection is interfering with trusted places, but not sure which one at this stage.
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