Apple has made significant changes to the networking stack of iOS/iPadOS 14 and higher to protect your identity and enhance security. One of those changes is to request permission for apps to use the "local network". OnSong features technologies that allow it to discover other instances of OnSong running on your local network so it can find and share songs and sets using OnSong Connect. When OnSong starts up, it establishes a connection to the network. In iOS/iPadOS 14 and higher, this requires permission. If you decline to allow access to the local network, features that rely on this such as OnSong Connect, OnSong Console, Google Chromecast, Scenes using Smartbulbs, and more may not operate.
Until Apple corrects this issue, you can simply enable Local Network in Settings. To do this, open the Settings app from your Home Screen down until your find OnSong or OnSong Pro in the Applications section. Tap to view the permissions that you have granted OnSong and turn on the "Local Network" option. When you use OnSong again, those features should function.
If you have updated to iOS/iPadOS 14 or higher, make sure you are using the latest version of the operating system and also use the latest version of OnSong available.
Also keep in mind that updating iOS/iPadOS can cause connectivity issues. If you are still experience performance issues or network dropouts, please consider resetting network settings.