Error message: "Too many simultaneous streams".
The number of simultaneous streams per HBO GO account is limited for security reasons. The username and password that you sign in with shouldn't be shared with anyone outside of your household. If you share your sign-in information, you might not be able to watch videos because too many people are using your profile at the same time.
If you're getting a "too many simultaneous streams" error message, have everyone in your household sign out of HBO GO (go to Settings > Sign Out), then restart their devices. Then sign back in and try playing a video.
If you're still getting the error...
If you'd like help deactivating devices that might be using your HBO GO account without your permission, contact HBO GO customer support to submit a deactivation request for the devices using your HBO GO account.