Make it so when you Follow a person or team thread
Make it so when you follow a person or team thread, that means you get notifications for them. Or if someone tries to use Teams to speak with you, that you actually get a notification that they are despite not having followed them yet. There's been several occasions where a person has tried to speak with me and others alongside me but we never got any indicator that they had sent us an IM or chat. I think Favoriting something should be synonymous with following them.