My connection to ChessLink / the board is active, but my moves are not transferred

Make sure that the data cable between the board and the ChessLink module is correctly and firmly connected.
Use the function for checking the board position in the app (Settings) to check if the connection is working properly.
Make sure that your Lichess connection is active.
Make sure that your online connection is stable. Make sure that you can access the Lichess server.
Perhaps your Lichess account was blocked by the server and you are unable to access the Lichess website?