Chrome: 71.0.3567.0 Dev

Steps to repro:
# Create a Sheet in Google Sheets with a few  cells of data
# Export this file as a .xlsx file
# With Chromevox running (ctrl+alt+z), open this .docx file in Office Editing for Docs, Sheets, and Slides
# Use arrow keys to navigate the spreadsheet

Expected: Cells should be spoken along with cell coordinates

Actual: Nothing is spoken