Hi @Dhaval_Gorasia
It’s because no records in your table currently match that condition. If you want to test it why don’t you set your number to 794 to pass the test and then you can use that record to test trigger an email. Once you are happy with the outcome set it back to 0.
If you want to get an email when any of your stock reaches 0 I would suggest not being so specific with your conditions. Simply use the remaining units = 0 condition and then the automation will trigger on any record meeting that condition rather than setting up a separate automation for each item.
You can merge fields from the record that gets triggered into your email so that you know which item has reached 0 units.