Macro to bring Excel data into Word template

[andreamehre]

I'm having trouble with the below Macro. This is used to find information in an excel worksheet and use that info to fill in a word template. We used this in the past (2019ish) and it ran just fine, but now I either get a "Run Time Error 5852," or it just crashes Word. I ran the debugger and the bolded line seems to be causing this. I've tried linking the excel file as the MailMerge source, but that didn't work either. I didn't write this and I'm pretty new to macros, so I'm not sure how else to trouble shoot this.

Sub Outage
Dim dsMain As MailMergeDataSource, Ticker As String
Ticker = InputBox("Enter the Ticker:")
With ActiveDocument.MailMerge.DataSource
    Do While .FindRecord(FindText:=Ticker, Field:="Ticker") = True
        If .DataFields("Ticker") = Ticker Then
            numRecord = .ActiveRecord
            Exit Do
        End If
    Loop
End With
End Sub