Can see one DVR but not the other - DirecTV DVR

For Can see one DVR but not the other, relating to DirecTV DVRs and receivers. I have an HR22-100 and an HR23-700. Both are networked via ethernet and both have received the update. On the HR23-700, the status shows the HR22-100 and the HR22 recordings are displayed on the recordings list.

However, the HR22-100 Multi-Room status displays "No networked DVRs found" and the other DVR's recordings do not show on the recordings list.

I have double-checked to ensure that the HR23-700 is set to share.

Any ideas???
Thanks in advance

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