MPA app and not able to fix my value

Hi,
I have downloaded the MPA app but I have not able to fix my MPA since it always give me in default MPA 1200.
I have tried to synchronize with both Garmin express and by the phone Garmin app but no result.
How can I change it?

http://baronbiosys.com/faq-items/how-can-i-get-my-garmin-apps-to-update-with-the-correct-fitness-signature/