Please provide a fully runnable example

I have the same problem. This is my code:

from docxtpl import DocxTemplate
doc = DocxTemplate("footnote.docx")
context = { 'what' : "Apples" }
doc.render(context)
doc.save("out.docx")

The result is a word document where {{what}} has been substituted in the main body text. but not in the footnote.

The footnote.docx template I'm using is available at https://github.com/staffanm/staffanm.github.io/raw/master/footnote.docx

Edit: Looking deeper into this, it seems that the underlying python-docx package does not support reading or writing footnotes at all yet (python-openxml/python-docx#1). To support this, the dependency on python-docx may need to be changed to the https://github.com/BayooG/bayoo-docx fork of that library.

I confirm, footnotes are not supported : adding request for enhancement label...

One precision : footnotes are not the same as footers which are supported.