Finding a word and/or variable in Word Document and changing font to Bold

I have a script where I am replacing a bookmark in a word document with text from a xml.

I have hard coded a few words into the word document via the bookmark properties. I am trying to turn the font of the strings I hardcoded into the document into bold and increase the font size

StigData is predefined earlier in my script… The script works fine its just not bolding the font.
$template = “Template.docx”
$wd = New-Object –comobject Word.Application
$doc=$wd.documents.Add($template)

foreach ($stigDataItem in $stigData)
{
$title = $stigDataItem.title
$check = $stigDataItem.group.Rule.check.‘check-content’
$ft = $stigDataItem.group.rule.fixtext.innerxml

$doc.Bookmarks.Item(“AllStigInfo”).Range.Text =“FixText” + “`r`n” + $ft + “`r`n” +“`r`n”
$doc.Bookmarks.Item(“AllStigInfo”).Range.Text =“Check Content” + “`r`n” + $check + “`r`n”
$doc.Bookmarks.Item(“AllStigInfo”).Range.Text =$title + “`r`n”

}

$selection = $wd.selection
$selection.Font.Bold = $True
$stringcheck = “Check Content”
$selection.TypeText($stringcheck)

$doc.SaveAs([ref]$newfile)
$doc.Close()
$wd.Quit()
Remove-Variable wd

I attempted to select the words I need to replace and replace it with a bold font with the section:
$selection = $wd.selection
$selection.Font.Bold = $True
$stringcheck = “Check Content”
$selection.TypeText($stringcheck)

However that just added a bold word to the document.

I am trying to bold everywhere that says FixText, Check Content, and $title. Also making $title a bigger font.

Also tried referring to https://blogs.technet.microsoft.com/heyscriptingguy/2006/02/01/how-can-i-boldface-a-specific-word-throughout-a-microsoft-word-document/ but it didn’t work out for me.