DOCEDOC123's profile

Contributor

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14 Messages

Saturday, July 26th, 2025

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Ubiquiti UCI activation timeout

I am replacing a working customer owned Arris SB8200 modem with a new Ubiquiti UCI (device Version 1.4.3). 
Activation using the Xfinity app V 5.55.0- fails with "Let's troubleshoot your equipment and try again". Same result after troubleshooting. 

  • CMAC address entered in Xfinity App matches UCI screen CMAC. Same timeout if I enter UCI MAC
  • During activation UCI shows connection to Comcast with transmit and receive (~.04 mbps)
  • Replacing UCI with Arris SB8200 restores Internet connection
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Accepted Solution

Contributor

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14 Messages

28 days ago

Ubiquiti UCI modem activated and working 568/118 Mbps.

Live chat with Xfinity support succeeded in the end.

Direct message to Xfinity support via this forum helped guide me through the snarl of multiple profiles on the Xfinity account, some of which used abandoned email addresses. So thanks to all.

Official Employee

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2.4K Messages

@DOCEDOC123

 Thanks for reaching out to us,  i'm glad everything got resolved for you in regards to getting your modem activated, feel free to reach out to us anytime and thanks for being the best part of Xfinity

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Expert

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112.8K Messages

1 month ago

Try calling 1-855-652-3446. That is their self-install device activation line. 

Official Employee

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1.6K Messages

29 days ago

Hi there, @DOCEDOC123! Thanks for reaching out to us here on the Community Forum. We can help get your new device activated. Please send a direct message to us by clicking the chat icon in the upper right corner of the page, click on the pen and paper icon, then enter “Xfinity Support” in the “To” section. Please include your full name and complete street address to get started. 

 

Contributor

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14 Messages

Sent direct message Xfinity Support with full name and complete street address

Expert

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112.8K Messages

29 days ago

@DOCEDOC123 

Were you able to get it activated using that method?

Contributor

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14 Messages

Did not try. Direct Message to Xfinity Support instead. Thanks for your response.

Expert

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112.8K Messages

@DOCEDOC123​ 

Quite welcome, and thanks for the reply. Be well !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

Expert

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112.8K Messages

28 days ago

Marked "Solved" topic now being closed.

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