How do I turn notifications on for my iPhone on my MacBook?

There's currently no native way to do this, but there are a couple of ways to do this with 3rd party apps:

Notifyr ($4). This will allow you to recieve push notifications from any app on your iOS device with your Mac. There are some base system requirements, so thee the web page for full details.

ForwardNotifier (Free). This requires you to jailbreak your phone but you will be able to get your push notification on macOS, Windows, and Linux.

How do I connect my iPhone notifications to my Macbook?

To get SMS, MMS, and Message alerts on your Mac, again sign into iCloud with the same Apple ID on both your phone and your Mac. Next, open Settings on your iPhone, choose Messages, and hit Send & Receive. Make sure you're using the right Apple ID, then tick both your phone number and email address.

Why don't I get text notifications on my iPhone when my macbook is on?

In order to only receive Messages notifications on your iPhone, you will need to turn off SMS Forwarding for your Mac. Take care. Thanks.

How do I get iMessage notifications on my Mac and iPhone?

On your Mac, choose Apple menu > System Settings, then click Notifications in the sidebar. (You may need to scroll down.) Go to Application Notifications on the right, click Messages, then do one of the following: Change notifications: Set options, such as the style of notifications or where to show them.

How do I get notifications to show on my Mac?

On your Mac, do any of the following: Open Notification Center: Click the date and time in the menu bar, or swipe left with two fingers from the right edge of the trackpad.