Instinct problem with paring garmin connect

Hellow, im looking for some help.
Actually i have problem to pair my new instinct. In garmin mobile app i try to add my watch like always. Pairing code display, i put it on my phone, there is a moment, then i see : Pairing unsuccessfull. After this i can see watch is connected in bluetooth settings on smartphone.
I tryied everything ( i think ) i mean:
pairing and unpairing
reboot phone and watch
clear datas
soft reset
hard reset
Same problem when i try to connect this watch on other smartphone. And same problem when i try to connect it to garmin express on windows app. Windows see this watch, but after i try to add it, there is a window to login on garmin connect to complete adding procedure, i can see there : Device Registration Error 0