make an appointment in Apple store in Lynfield, Ma.

We are end users like you. We cannot make appointments.

Understand that due to state and local COVID restrictions on businesses, some Apple stores cannot do appointments now. Use this to find how this affects the store you use:

Apple Store - Find a Store - Apple

noting all the COVID information, restrictions and FAQs in this section of that page:

As a result of COVID regulations reducing store hours and how many people can be in a store at one time, Apple stores that can open are so pressed with appointment requests that dates available may be weeks if not months out.

Most people do the migrations themselves.

Move your content to a new Mac - Apple Support

As we have said, there is nothing we can do for you. If the appointment link on the support website is not working, call http://www.apple.com/retail/ the store and press usually extension 5 to get ahold of a real person. If the store is staffed they may be able to help you.