With the release of macOS 15.0 Sequoia you must do the following to enable sync'ing between macOS and Pocketpedia:
To allow or revoke Pocketpedia app's access to your local network on a Mac, you do the following:
1. Select the Apple menu, then System Settings
2. Click Privacy & Security in the sidebar
3. Click Local Network
4. Turn the ability to access your local network on or off for each app listed
Thanks to mindzeye for this very helpful hint. Bookpedia 7 no longer syncing with Pocketpedia app