Attempting to update form 8829, final federal return check and Turbo Tax isn't accepting my entry, Home Office. I type home office and it doesn't populate form 8829

Try going back through the step-by-step process to get to your Schedule C where the home office expenses were entered instead of entering 'home office' in the search box.  You can search for 'Schedule C' to get started.

Or, if you entered home office expenses as part of Form 2106, then go back to that section.  Search 'form 2106' to go to that section.