0:00 Run pace on Vivoactive 5 while running with Coach Greg's program, but okay in the app after the workout

Hi ! 

I am having difficulty obtaining my pace while I run with the predetermined program from Coach Greg. To ensure the synchronization is well done before starting the program, I wait until I have the green light for the GPS connection and press start. After my warm-up, I was notified through my earbuds that my pace was 0:00 and I could also navigate the interface to see it displayed at 0:00. If I do the whole run, I will not have a pace available. However, if I stop the workout and start another run, then I will have my pace and my pace will be correctly notified. 

Also, when I sync my watch with my app, I can access the pace I ran during the run on the Coach Greg program. 

I would like this problem to be resolved, but I do not know what are the steps or the troubleshooting I must do. Does anyone know how to manage this problem?

Thank you so much! 

Christophe