Mention a team - will receive email notification ?

Hi, I’m having a strange situation, when a Team is mentioned in the Updates section - should all the team members receive an email notification ?

What happens is that the members from one team do receive but not all the times when the team is mentioned and the same member belonging to 2 other teams, never receive an email notification.

I have checked all the email notifications in the Set-up, is there anything I can check ?

thanks,

Bianca