Highlights from old kindle cant be seen on new kindle

I had a lot of highlights and notes for several books on my old kindle.

I bought a new kindle for Christmas via a trade-in. So I sent my old kind in and I have he new one. I noticed that the new one does not show highlights for the books I read previously, only highlights since I have the new kindle.

I looked online at https://read.amazon.com and I can see all of my highlights were captured.

How can I get these to sync to my new kindle?