Table of Content and Kindle

I was about to be a victim too, planning TOC at the end. After reading David’s books I became convinced it was better at the end. Oh well, Amazon does not like it and you get punished hard by them.
Read the story:
Amazon Takes Aim At Scammers But Hits Authors

Amazon Takes Aim At Scammers But Hits Authors

As David points out the rule is indeed in the Kindle guidelines,
see here the link:
Kindle Publishing Guidelines (PDF)
https://kindlegen.s3.amazonaws.com/AmazonKindlePublishingGuidelines.pdf