THIS WILL NOT WORK ON ANY OTHER ROW SERIES EXCEPT FOR THE ROW SPORT!
Take off the left side shroud.
Where the Bluetooth module is, do you see the slider still attached to the magnet arm or is it hanging down?
If it is no longer attached then the app is not being told what resistance level you are on, when you row.
Images show what it should look like and what it might look like if it is no longer attached.
If yours is no longer attached then please re-attach it.
What it should look like
What it may look like if it is no longer attached.