Hi @Robert_Tolmach.
When you say notify “all team members”, my assumption is you mean all the members across your organisation? For this, the best option I know of is to create a Team with the entire org as members and utilize the team communications. Ex - Create a “Staff” team with all the members.
Then, during a project or other team conversation, you can just @Staff and it will notifiy everyone.
You can also use team conversations as well for non-project related comms: https://asana.com/guide/help/conversations/team-conversations
There is an older forum discussion around this topic: Organisation Communication Board Hope this helps!