Hey Herbal--Solutions,
If we understand correctly, there is trouble using Migration Assistant to transfer data to the new MacBook. We would recommend you use these articles for more information.
Are the two computers connected to each other directly using an ethernet cable?
Are you able to create a Time Machine backup of the old MacBook, you can then restore the new computer using that backup?
"Connect the two computers with a cable (such as Ethernet or Thunderbolt)"
Transfer your information to Mac from another computer or device
Move your content to a new Mac
Thank you for using Apple Support Communities. Have a good one.