When signing into Chat for the first time, you'll be prompted to to "Allow" or "Deny" push notifications
If you miss this message, no worries, it will present itself each time you login or you can simply enable the notifications from your iPhone's notification settings;
Settings > Notifications > Teamwork Chat.
Once push notifications are enabled, user can receive notifications once they are "@mentioned" or "@all" is used.
Please note: Users will only receive notifications on mobile when the desktop app and browser version of Chat is closed