iPhone XS Max can't sync with MacBook in MacOS Catalina

Hi larissaoreis,

Thanks for getting back to us with those details. Are you being prompted to trust the Mac you're using at any point during this process? If not, or it seems that the response isn't accepted, try these steps next:

"Get help 

If you tap Trust or Don't Trust but doesn't accept your answer, or if the Trust alert won't appear, follow these steps. Try again after each:

1. 1. Make sure that your computer has the latest version of macOS or the latest version of iTunes. 
   2. Disconnect and reconnect your device from your computer.
   3. Restart your computer.
   4. Restart your device:
      1. iPhone
      2. iPad
      3. iPod touch
   5. Reset your Trust settings.

If the above steps don't help, go to Settings > General > Reset and tap Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before.

If you downloaded iTunes for Windows from the Microsoft Store, make sure that iTunes Mobile Device Helper is enabled as a startup item.

If you still need help, contact Apple Support."

About the 'Trust This Computer' alert on your iPhone, iPad, or iPod touch

Let us know if you continue to have trouble.

Take Care.

Hi larissaoreis,

Thanks for reaching out in Apple Support Communities. We understand that your iPhone XS Max isn't recognized by your Mac when you connect it but another iPhone is recognized without issue. We know how important it is to be able to sync with your computer; we'd like to help. We recommend that you start with these steps: If your computer doesn't recognize your iPhone, iPad, or iPod

If you continue to have trouble, please provide these details:

What happens when you try to sync with the iPhone XS Max? If you see an error message, what does it say?

Best Regards.