loss of email service

No -- that doesn't answer my question really -- how do I do that? "Once transitioned?" How does that happen? I never got a notice, I just suddenly stopped getting email.  "You can link..." Again, how does one do that? As noted, it was the technician who set up my Xfinity account who did all this for me. I have no idea how to transition or connect.

And having spent half an hour at an Xfinity store today, with the person there having no luck accessing my email, I feel fairly confident that it's not really easy. 

I wouldn't say that I "missed" the transition message -- I didn't get it. And I don't have another account. I have only the Comcast account and the technician set it up so that att.net could be a sub-account. There is a message to enter my Yahoo password, but I don't have a Yahoo password -- and I can't set one up because it will send an email to verify my identity -- but I can't get email. 

All those emails have to be somewhere -- and on my Apple Mail program, when I click on the icon, it asks for my Yahoo password -- so clearly, on some level, the system knows that Apple Mail is where I access my mail. But how do I set up a Yahoo email password when I can't do the "forgot password" option because it relies on sending an email.

I apologize that you are having these issues. I am glad the store was also able to try to assist. As for clarification on how you would know about the transition, I was able to locate an FAQ section on our email page that may be more clear on how we provided alerts. Scroll down under the log in option and the help tiles to the Frequently Asked Questions. This section covers most of your concerns with the Xfinity transition. 

With this being Apple Mail and an att.net issue, we would not be able to provide much assistance. You may want to contact Apple support to see if Yahoo is just one of the emails you can use, or if it is asking you to set up a Yahoo email account. If you are still able to log in to your Xfinity email when you used the link above, you have not been transitioned yet. You may have had your Xfinity email forwarded to your att.net email address and used it as your contact information on your account, causing this confusion, but do not provide support for att.net email accounts if you are running into issues there and not at Xfinity.com

It is not an att account. It is a Comcast account, simply set up with the att address as a subaccount. As for the request above about checking for a transition email on my Comcast account -- there are only about five emails in the account that turns up when I sign in, so unless there is somewhere else to look, I have not received a transition notice -- just the request to sign in to Yahoo. Unfortunately for me, AT&T has also not been able to identify any account for me. Someone out there has the answer -- probably the technician who set up my Xfinity account but who is no longer in the area or doing this work. 

Is there some way to send a screen shot without using email, since I can't use email?

Thank you. Just got an email from Xfinity that another password was reset during this (got the email because I now have email again). But if they have reset a password for another account, I can't help but wonder if that is now going to be a problem. Sign.