I have not found the forum for this question, so I put it in this one because I am going to name the Forerunner 245.
I have the Garmin HRM Dual heart rate monitor and I cannot connect it to the Garmin Connect app; It detects it but when pairing it it gives an error all the time. It seems very strange to me because I have it connected to the Strava app and the Forerunner 245 itself, but as I said, there is no way to pair it in the app.
Does anyone know what it could be and how to fix it?