Could you please attach your sample data as twbx format,
I cannot share the dashboard in question, as it has company owned & sensitive material. But I can answer any questions as it pertains to how the data is structured.
I tried to make a mock dataset and workbook,
likely overly simplistic. Would be grateful if you
would adjust them to more close match your own.
The highlighting of both symbols seemed to work in the attached.
In my example, I had selected it to highlight only on
the Selected Field of [Quote], and I had to make sure
[Quote] was on the detail shelf of both of the dual axes.
Please workbook v10.3 and dataset attached in the Forum Thread.