We're seeing an issue affecting new account creation and user invitation. Our team has identified the root cause and are working on a fix now. We're very sorry for the trouble!
We're aware of an issue currently affecting Chat in Basecamp 5. We're looking into a fix now. We're sorry for the disruption and will provide further updates shortly.
All services have been restored and our team are continuing to monitor the situation. So sorry for the interruption here.