Tivo Mini cannot find my Roamio V70

I have a Tivo Mini and I can't get it to recognize the Tivo on my network to connect.  This has worked in the past with a different Mini, but my old Mini broke so I had to bring up a new Mini.  Here is the current configuration and what I've tried.

• The Tivo on the system is a Roamio.
• They are both coming right off my router without any switch in between
• I've tried power cycling the entire system, including the router, and both Tivo Roamio and Mini in the order recommended
• I have reconnected to the service repeatedly over the past several days, and powered cycled both the Tivo and Mini
• The message says that there is no DVR available, with the error code V70

The Mini was originally owned by someone else, and I had it reactivated to my account.  I am beginning to suspect that there is some backend issue where the activation did not complete even though it claims to be on my account.  Any ideas on how to get them to see each other?