0.0 flashing on screen

Just got the new scale....
After a lot of trouble and 70min on phone with Garmin, we finally managed to set it up and scale shows up in Express and in Connect.

But now........when I step on it I get 0.0 kg on screen. This is on there for 5 sec, and then dissapears for 5 sec...and just repeats the loop....until it goes to sleep.
I stand on the scale, with no effect...the loop just continues.

Did anyone have an issue like this?