There was recently a review of all accounts with elevated streaming API access. You should have gotten an email asking you to explain how you’re using your elevated access a number of weeks ago. The email would have been sent to the email associated with your request for elevated streaming access – an email that could be outdated or no longer monitored. You can reach out to our platform operations team to re-request access using https://support.twitter.com/forms/platform
Be sure and describe how you’re using your elevated access today. Also, it would be wise to begin using OAuth 1.0A when connecting to the Streaming API. Basic Auth is deprecated and currently only usable by those with elevated streaming roles, but that won’t continue forever.
