Populate PDF checkbox with Application.SendKeys " "

[alxn]

I'm trying to populate a PDF document with information inside of my Excel worksheet, I can populate the PDF with regular words such as names and numbers but I need to populate some checkboxes based on the word "TRUE" inside my Excel sheet, I know that by physically hitting the spacebar it will check the checkbox but when using Application.SendKeys " " nothing happens. Any ideas? The PDF app I'm using is PDF Xchange.

**Check boxes inside the PDF document** When I hit the space bar in my keyboard it checks the box

**Example of Excel sheet I'm using to populate** In this case the word "TRUE" would trigger Application.SendKey (" ")

LastRow = .Range("E9999").End(xlUp).Row  'LastRow
    For CustRow = 2 To 2 'LastRow
    FirstName = .Range("T" & CustRow).Value 'LastName
    EplyrName = .Range("B" & CustRow).Value 'Employer Name

Application.SendKeys "{Tab}", True
    For Each c In Range("CJ" & CustRow).Cells
        If c.Value = "TRUE" Then Application.SendKeys " ", True 'Part iii Check box"
        Application.Wait Now + 0.00001
    Next c
        
    Application.SendKeys "{Tab}", True
    For Each c In Range("CQ" & CustRow).Cells
        If c.Value = "TRUE" Then Application.SendKeys " ", True 'Covered all 12 months?"
        Application.Wait Now + 0.00001
    Next c
    
    Application.SendKeys "{Tab}", True
    For Each c In Range("CR" & CustRow).Cells
        If c.Value = True Then Application.SendKeys " ", True 'Covered January?"
        Application.Wait Now + 0.00001
    Next c
    
    Application.SendKeys "{Tab}", True
    For Each c In Range("CS" & CustRow).Cells
        If c.Value = True Then Application.SendKeys (" "), True 'Covered February?
        Application.Wait Now + 0.00001
    Next c