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I was able to resolve this with @yl3. So this is a situation where legacy customers were set up with a username by agents. We now only primarily allow invites to a mobile phone number or a non-Comcast.net email, that way customers have a recovery method for password reset and to prevent this scenario.

There are a few ways you as a customer can go about fixing this:

Say you have an active Account at 123 Main Street (generic example)

Account at 123 Main Street may have an Xfinity ID (username only) tied to it. You can find that out via www.xfinity.com/id. You can also try www.xfinity.com/getstarted if you believe you've never set one up.

What you're signing into the forums with may not be tied to any account, but may have a mobile number or email tied to it. When you use the forum credentials to sign into My Account you may see the issues listed above where it says you're still setting up services. This is beyond the 2-3 days after setting up your account for the first time.

Do a password reset on the Xfinity ID tied to 123 Main Street and sign into the correct Xfinity ID

1. Once you're in My Account, go to Users (https://customer.xfinity.com/users) and invite the forum sign-in you're using (via either the @comcast.net or the email or the mobile phone number) and complete the flow with your address for verification.
2. You can now choose which Xfinity ID you care about:
   1. If it's the one you just invited, use Transfer Admin Rights https://www.xfinity.com/support/articles/change-your-primary-account-user to promote the preferred Xfinity ID Secondary to the Primary.
   2. If it's the one you signed into, remove the contact points on the secondary Xfinity ID you invited, and add them to your Primary Xfinity ID.
3. Also make sure you've set up automatic payments on whichever Xfinity ID you end up going with. 

CC: @ComcastRob