A change on Instagram's side has been affecting how Instagram conversations are retrieved. What you may notice:

Listing chats for an Instagram account (GET /api/v1/chats) may return a 404 error. Some Instagram accounts may show an error status, even though their connection is still valid. You don't need to reconnect your accounts. Your accounts and sessions are not affected. Our team has identified the cause and is working on a fix. We'll let you know as soon as it's deployed.