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This issue has been resolved and the HMH Technical Support phone line is available.
Thank you for your patience.
Please be aware that the HMH Technical Support phone number (800-323-9239) is currently unavailable. Visit our HMH Support site for additional support options including emailing and chat.
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
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