Yep, I'm dumb! I was getting that too! Turns out that's because I was going to pineconeresearch.com, their actual url is members.pineconeresearch.com. Durp.
Are you using a bookmarked link? I got that message when i start to type pineconeresearch in the browser field as well as using a bookmarked link. I googled pinecone research and was able to get the site to come up with no issues (this was a few days ago though)