Error when testing Lexbot with Kendra Search Intent

I receive the following error message when testing a Lexbot that contains a KendraSearchIntent. I followed this guide to add the intent to the bot. https://docs.aws.amazon.com/lex/latest/dg/faq-bot-kendra-search.html. Per guide, I used the built-in Kendra intent. In creating the intent, I chose Add Amazon Kendra permissions, to try to avoid permission issues. I didn't use any filters. In Closing response, I used only Kendra's standard responses, like x-amz-lex:kendra-search-response-question_answer-answer-1.

Any suggestions?

Error: { "errorMsg": "Invalid Bot Configuration: Amazon Lex could not access your Amazon Kendra index. There is a problem with your configuration. Check the configuration and try your request again." }