There are several issues that come at a streaming time like Your screen getting black, the image not loading, Video buffering, the HBO Max account not supporting your device App showing the error message. Every streaming platform has its customer service help team. HBO Max has its own customer service help number, which is Hbo Technical Support Number USA +44-748-072-8351 (UK) | +1-888-226-0555 (USA/Canada). We are a third-party service provider in the industry for many other reasons. Security is always related to third-party customer service providers.