I read this on another forum. It's s copy/paste from the OP who posted it:
"I received an email from Amazon that states:
First, we’ve created a new home for all your Kindle notes and highlights that’s easy to access and review from your phone, tablet, or PC. All the notes and highlights you’ve made over the years with Kindle are safe and sound at
https://read.amazon.com/notebook.
and then
In addition, if you like to share what you’re reading with others, we’re merging some of kindle.amazon.com’s features into Goodreads. Goodreads—an Amazon subsidiary—is the world’s largest community of readers, with more than 60 million members. You can enjoy great features, like keeping track of what you read...
and to top it off:
Please note that your Kindle profile, book lists, and notes and highlights will no longer be accessible via
https://kindle.amazon.com after August 31, 2017."