Screen sharing through Messages not working

Hello ALLingames, 

Thank you for posting in the Apple Support Communities. I understand you are unable to share screens via Messages on your new MacBook Pro.

When you click the Screen Share button, are you prompted with one of the following messages?

• Share your screen
• View your friend’s screen

Let’s ensure screen sharing is properly set up on your Mac.

1. “On your Mac, choose Apple menu > System Preferences, then click Sharing.
2. If Remote Management is selected, deselect it. You can’t have both Screen Sharing and Remote Management on at the same time.
3. Select the Screen Sharing checkbox.
4. To specify who can share your screen, select one of the following:

• • All users: Any of your computer’s users can share your screen, except sharing-only users and guest users. If your Mac is connected to a network account server, anyone with an account on that server can share your screen using their network user name and password. See Join your Mac to a network account server.
  • Only these users: Screen sharing is restricted to specific users.

1. If you selected “Only these users,” click the Add button at the bottom of the users list, then do one of the following:

• • Select a user from Users & Groups, which includes all the users of your Mac except sharing-only users and guest users.
  • Select a user from Network Users or Network Groups, which includes users and groups with network server accounts. Network users and members of network groups can use their network name and password to connect to your Mac for screen sharing.

1. To set additional options for screen sharing, click Computer Settings, then select one or both of the following:

• • Anyone may request permission to control screen: Before other computer users begin sharing the screen of your Mac, they can ask for permission instead of entering a user name and password.
  • VNC viewers may control screen with password: Other users can share your screen using a VNC viewer app—on iPad or a Windows PC, for example—by entering the password you specify here. If you select this option, you should create a very secure password.”

You may find additional information via one of the resources linked below.

• Share screens using Messages on Mac
• Turn Mac screen sharing on or off

If your issue persists after taking the steps above, I would suggest starting your MacBook Pro in safe mode, following the guide below.

• Use safe mode to isolate issues with your Mac

I hope this information helps get you back up and running.

Have a good one!