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Question

serial number not being recognized.

  • November 8, 2025
  • 2 replies
  • 49 views

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I purchased an SB 8200 off Amazon. It’s connected and was activated by optimum. It works other than I can’t get to the modem web page and when try and register it says serial number not found. I tried calling the number located in manual but it just hangs up on me. The serial number is the same on box as is on bottom of modem. What give ?

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2 replies

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  • The Many
  • November 10, 2025

Registration of my modem never worked via the web pages. Only via the mobile app. 😤☹️


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I purchased an SB 8200 off Amazon. It’s connected and was activated by optimum. It works other than I can’t get to the modem web page and when try and register it says serial number not found. I tried calling the number located in manual but it just hangs up on me. The serial number is the same on box as is on bottom of modem. What give ?

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