I actually don't have a problem. Posting this just in case someone else runs across this.
- Added a Roamio Pro to my home to replace an XL4
- Attempted to connect an existing Mini for live TV and get the V70/red X
- Mini could connect to another XL4 without issue and all TiVos could play shows from any other TiVo
- Added another Mini to the network, was able to connect to the new Roamio
- Swapped locations of the two Minis, was able to use new one, not old one
- Did a erase all on the old Mini and went through setup again
- Now I can connect my existing Mini to the new Roamio
Thought that was sort of strange, but at least it works! TiVo was going to send me a new Roamio.