In that photo, the thermostat is set to 'cool' mode. It should be set to 'heat' mode for heat mat use. I can't say why the unit isn't applying power right now, though, in spite of the actual temp being higher than the set temp (the instruction manual says that in cool mode when power is applied the snowflake icon appears next to 'cool', but that isn't the case here).
You could change it to heat mode and see how it works.
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