'Selenium trying to get elements

I'd like to get the elements by Selenium as the attached pic:

ess-cell class="data-numeric"

However, the following code didn't work even though:

find_element_by_tag_name('div')

part works correctly. Does anyone know why?

row.find_element_by_tag_name('div').find_element_by_tag_name('div').find_elements_by_tag_name('ess-cell')

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