On how many devices can I stream a video at the same time? April 14, 2018 15:57 Updated You can watch content at two Supported Devices at a time. Keep in mind that, for each device you need to have downloaded and installed the HBO GO app and have the app active in the device. Related articles Can I register more than one device on my HBO GO account? Where can I manage my devices? I am currently subscribed to HBO as part of my TV package. Do I have access to HBO GO on my computer and other devices? I can't remember my username and/or password... what do I do? I got an 2010 error message. What does this mean?