Hi Chelsea,
To answer your other question, yes I do have other Echos and those are selected to do the Announcements (those work fine).
I carefully followed the steps – uninstall Alexa App, reboot, reinstall. When I launch the app and go into Announcements again, it still shows the two Echos as unselected. Was the uninstall/reboot/reinstall supposed to change them to be selected? I haven’t made any changes yet so I’ll await your next suggestion.