Perhaps nice instructions, but the link is broken.
The problem many people have is they don't have enough mobile phone numbers and non-Comcast email accounts to set up 2-factor authentication on multiple username accounts.
Comcast's implementation for security and two factor authentication is flawed (I'm being extremely kind here) for the case where one has several secondary user names as part of the same Xfinitiy and email account.
The Comcast portal hack on 31 January 2018 is scary. I can't access my primary account (4 days now) and I can't set up two factor authentication on most of our secondary usernames.
Comcast "support agents" say to use a secret question as on of the two factor authentications, but only one secondary account has offered that option.
Try a little harder, Comcast!
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