Just grabbed Plex Dash for iOS. I am a PlexPass sub. The app lets me log in fine, but no servers appear in the list (just ??). Both Plex and Plexamp work perfectly and find all 3 of my servers (2 lical LAN and 1 remote).
ALSO… when I go to iOS Settings to check app perms, the app does NOT show in the list of installed apps. Tried logout, reinstall.
Tested on iPhone 11 Pro Max and iPad Pro 10.5”.
Cheers.