The printer holds the bottom of the page to turn the page and cannot print within the bottom area of the page.

To make sure the footer / page numbers print, increase the bottom margin to at least 0.7 in. (1.8 cm).

In MICROSOFT WORD Software, page numbers are often part of the footer. To adjust the bottom margin:
  1. Select File, then Page Setup.
  2. On the Margins tab, set the footer distance from the edge of the page.