I installed a 622 at a 811 household, and the 811 was showing all channels. I was told at the release of the 211, that it wouldn't happen. I guess dish just doesn't have the facts straight.
There are some MPEG4 channels that the 811 can't see because it's an MPEG2 receiver. Try Espn2 channel 9425 like Bob suggested, bet you $1000 it's not there.