No Email

My wife is a retired Comcast employee and is the owner of the account, of which we have 3 email addresses (She has T-bird v.115 and Win 10, I have a home-made computer and Ubuntu w/ T-bird):

1. her-owner@comcast.net (works  fine w/ 2-step validation)
2. her-everyday@comcast.net (DOES NOT WORK AND DOESN'T HAVE 2-STEP VALIDATION)
3. mine@comcast.net (works  fine w/ 2-step validation)
   (The Comcast I.D.'s are not the real ones)

Yesterday, she went to check her email (#2 above), and she got a message from T-bird that the password was wrong.  We went to the Xfinity website and tried to sign in.  It said "Reset your xFINITY password", but at the next page it showed a "Connect to your home Wi-Fi to reset your password".  I didn't want to reset the router p/w, anyway,  it's fiber, fast and  doesn't belong to Xfinity in the first place.

If anyone could help us get that email back, we'd be grateful.

Thanks.