ABC Missing in regular and HD - XFinity

In Pittsburgh ABC is on channels 8 and 804 (HD), but on one television, I can't get either of these channels. I turned on the TV and they don't show on the Guide nor are these numbers accepted manually. How can I fix this?

This question, "ABC Missing in regular and HD," is about XFinity-Comcast TV television equipment.

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“Earlier today, a few TV channels in some markets were temporarily unavailable. We received inaccurate data from the vendor who provides our programming guide data, which caused this temporary interruption. The vendor has corrected this, and most channels have already been restored. We expect any remaining channels to be available momentarily. We apologize for the inconvenience and are working with the vendor to prevent this from happening again.”