Cannot calibrate my runpod on my phone

I am using a Samsung A7 2018 with the latest android version. The zwift app is also updated.
The bluetooth is on an synced with the chest strap and run pod but when I try to calibrate it it doesn’t record any movement. The green light on the device is on when moving.
I tried restarting the app and phone several times and didn’t work either.
Anyone else facing same problems? The pod works on my iPad but I would prefer taking only my phone to the gym.

Thanks in advance for your support and ride on!

Fede