I have that font selected, and the correct calculated string, but it does not render a barcode.
<TextRun>
<Value>=Code.GetCode128EncodedString(First(Fields!Calculated_smwh.Value, "BAQReportResult"))</Value>
<Style>
<FontFamily>Code128</FontFamily>
<FontSize>16pt</FontSize>
</Style>
</TextRun>
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