Hi @Mattia_Panozzo, welcome to the forums!
I’m Fernanda from Zwift.
This caught my attention and I couldn’t miss the chance to help you! The Misurino B+ cadence+power sensor needs to be set to 12 blinks for the Turbo Muin Trainer (you can find this on the table within the instructions of the sensor).
Could you please confirm to us if this is correctly selected on your device configuration?
On the other hand, remember to wake up the device (pedaling) before pairing the power sensor, based on other Zwifter’s experience, the pairing of the sensor can be different in Zwift, I would like you to check this forum thread with the correct steps.
keep us posted!