Pairing watch with Samsung phone

Hello

my Vivoactive 4 cannot connect with my Galaxy M52 5G.

the 6-digit code appears only for a few tenths of a second and therefore it is impossible to read the code and transfer it to the phone for pairing. Sometimes the message "pairing failed" also appears.

I tried to turn on / off both the smartphone and the Vivoactive 4 but I have not solved the problem and updated the Garmin app to latest version on phone. 

What should I do ?

Thanks