TL;DR - Your cell number may still be tied to an old account, Comcast may have to merge the old account username with your existing one.
I recently had this same issue when trying to set up 2-step verification to sign in to my account. After calling comcast a bunch of times, we figured out that my number was still attached to an old account that I had with them. I had moved from state to state a few times, cancelled my previous accounts and then set up new accounts. Turns out that somehow, my cell phone was still attached to one of my old accounts, even though the account had been deactivated.
Their initial solution was to dissociate the number from that old account, but for some reason they could not do so or it just did not work (they said to wait 48 hours before attempting the 2-step verification set up, which I did).
Finally one of the billing and accounting folks (or mght have been someone from security department) who knew what they were doing suggested merging the Username from the previous account with the current one. They basically added the old username to my new (current) account as an authorized user. And that ensured the phone number was only tied to one account - the current one.
I was then able to complete the initial set up I wanted without getting a message that the number already existed.
Hope this helps.
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So, after enabling 2 step verification, I started receiving codes on my phone as if I (or someone) was attempting to log in to my account. I noticed one time that I received it after logging into my bank account where I have a bunch of my utilities accounts aggregated (Something like 'Mint . com' for those that are familiar). My guess was that signing in to the bank account and going to the page to view all these accounts triggered a refresh by the website to get the latest information from all Utilities companies, including Comcast - which would explain the text I got with a verification code. I tried this one more time by signing, out, signing back in and hitting refresh, and I got another text with a verification code.
However, this does not fully explain everything, as I have sometimes woken up at 5:00AM eastern time, to the same "New sign in Attempt" email. I thought to myself - maybe the aggregated utilities system does a daily refresh - but then I don't get these "Xfinity sign in" emails with any kind of reglarity or consistency. It could be two in 2 hours, then none for the next 2 days, then one everyday for 3 days, and then one a week after - somethat random.
Does anyone else who has experienced this issue have any other account or website that they have granted access to their Xfinity account in this manner? If so, it could at least partially explain what has been going on.
Side note, I won't even go into how (and how many times) I had to explain what 2-step verification is to Comcast employees from mulitple departments, including their security department. They had no idea what I was talking about.
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Thanks for your response, but it does not address the real issue. I use Windows machines at home to login, and I know exactly when I log in or attempt to log in from any of my computers. The issue here is not that I am receiving notifications of new logins that I make.
I get at lease 1 message like this every other day, and it is always from a GNU/Linux OS, and always a Chrome Browser. I know this is not me, and I have changed my password twice. From different computers and different locations (with VPN). Just to make sure that my home network was not compromised.
Like others have mentioned, this must be a bug in a recent update at Xfinity. Hopefully they get this sorted out.
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Thanks USAF_E-8_RET, I made sure not to click on any links, but I hovered over them to make sure they were directing me to legitimate Xfinity pages (and it looked like all the links checked out). I also checked the "From:" email address and it is the same one that sends me reminders about my bill. I ended up changing my login credentials, but I am still baffled. Unfortunately, as far as identifying a legitimate Xfinity email based on the icon next to the email in my inbox, I automoatically forward all mail to a non-Comcast address (and a copy is not preserved in my Comcast inbox) - so I cannot verify that way.
So far, there hasn't been any activity on my Xfinity account or any of my other online accounts to the best of my knowledge.
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I woke up this morning to an email from email@example.com stating there there was:
"New Sign in with your Xfinity Username".
And then it proceeded to provide the following information:
Date: March 17, 2017 7:30AM EST
Operating System: GNU / Linux
Browser Type: Chrome
Problem is I was still asleep at this time, and I have not given anyone my credentials. Can't seem to get any information from Customer Service, they keep giving me the run around, putting me on hold, transferring me and generally not understanding the issue.
I just want to know how legit this is, make sure it is not some random automatically generated message, see if I can get some more information (e.g. location).
I have also heard that this email alert could be sent even if there just an attempted login, without it being succesful.
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