I had the same issue. Just got off the phone with Xfinity and got it handled. Once I got a live person on the phone, I explained the issue and specified it concerned the Streaming App. They transferred me to the xFi Video Repair Team. The agent on this team knew exactly what to do and was able to deprovision all the devices for me. She had to do one at a time though so it took a little bit of time being on hold, but otherwise, it was painless. She was also able to look on the backend and tell me if anyone had added their name as an authorized user of my account. If you haven't already done so, I recommend changing your password and setting up the 2-factor authentation.
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