I have a form where I want to enter Comments/Updates in the field shown "TextInput_NewComments.Text" and have those added to the Comment History field. Currently I have both fields in the Comments_DataCard1.

In the default property of Comments_DataCard1 I have the following...
If(
frmIssueTracker=FormMode.Edit,
ThisItem.Comments & User().FullName & " - " & Text(Now(), "mm/dd/yyyy hh:mm:ss") & " - " & 'TextInput_NewComments.Text'.Text & Char(10) & Char(10),
ThisItem.Comments,
)
When I add text to TextInput_NewComments.Text I am not getting any changes to the History fields.
Any suggestions on what I am doing incorrectly?