Quote:
"Your community privileges may have been revoked for one or more of the following reasons:
– Elements of your account indicate a relationship to sellers, publishers, or other reviewers of the products you review.
– Your reviews were posted in exchange for compensation, such as gift cards to purchase the product, product refunds, review swaps, or free or discounted products.
– You requested free or discounted products in exchange for reviews"
That's taken from a response that someone posting on this thread got from Amazon:
https://sellercentral.amazon.com/forums/t/message-not-in-good-standing-with-the-amazon-community/350960/35
Looking at that thread, and loads of similar ones it across many forums, it seems that you need to contact Amazon to try to get your ban rescinded. (It was probably imposed by a bot which thinks that your comments aren't genuine),