So, I have the Disney+ app that opens in an instance of edge. When I pin it to the main monitor is shows the Disney+ icon, but when I pin it on any secondary or tertiary monitor's is displays as a blue box with a question mark inside.
I can work around, slightly, but editing said pinned app, and choosing the app it should open, but this works more like a shortcut now than a pinned app. i.e. it displays the icon and opens the app, but not as an extension of the pinned app, it opens in separate space on the taskbar, so essentially it looks like I have two Disney apps open or present.