There are a few complaints on this on the Xfinity forum but the threads end without any resolve. I suspect either the discrepancy eventually resolved itself or the subscribers had replaced their cable-boxes.
The most-involved response from Xfinity"
"Hi there. That's a pretty unique error message/code that we don't see too often. It seems like the box may have missed a firmware update. If resetting the box didn't work, another option is doing a system refresh through our My Account app. If that doesn't work, let us know. We may need to manually force some signals through to the equipment" (XfinityMorgan, 2022)
One subscriber followed the recommendation, nothing, replaced box.