Q: why won't my apple tv sync with my new macbook pro, they are both on the same wifi signal

Do you have Show mirroring options in the menu bar when available. This will give you the ikon in the menu bar whenever it's available.

System Preferences>Displays check the box.

Hope this helps.

PJRS

WIthout proper information from you it is hard to properly investigate, however the issue is likely your laptop.