Hello @Texasvolfan123, thanks for reaching out to our Forums! I'm sorry to hear you are having troubles logging back into to your Xfinity online account. I would be more than happy to assist you with getting you successfully logged back in. Just to confirm, have you attempted logging in with just your username and leaving out the comcast.net? Also, did you happen to already clear your Cache & Cookies?
@Texasvolfan123, I never heard back from you on here, so I will be locking this thread. Please be sure to reach back out if you still need assistance with this logging in concern. Please create a new Public post for any new issues or concerns, we're here to help. Thanks and we appreciate you being the best part of Comcast.