Can't manage my plan because I have flex - PLEASE HELP

Responding to the post from @ComcastMorgan at: https://forums.xfinity.com/t5/Sign-In-and-Account-Management/Can-t-manage-my-plan-because-I-have-flex-PLEASE-HELP-Updated/m-p/3372003/highlight/true#M34147

I am looking for options to change or upgrade my services, but I am receiving the message "Since Flex is in your plan, the Xfinity Assistant can help complete your order online." Can you fix my account so I can view offers for internet and tv service online?

Update: I chatted with an Xfinity rep to review offers.