Hey Don,
RAUs don't have a lot of brains to them - they basically make a HTTPS connection to the OCI server, and through that, speak some APIs to OCI to bootstrap themselves - they download datasource code from the server, learn what datasources live on them, etc.
It is somewhat odd to me that the RAU would actually have registered (which is what I am interpreting from your screenshot - if they hadn't, you wouldn't seem them), so we can somewhat assume that there are no name resolution issues, as otherwise they wouldn't have gotten that far.
Most RAU problems are in the networking/DNS realm/OCI server has a firewall enabled domain.
Here, it would be worth looking at the ..\sanscreen\acq\log\acq.log master acquisition logs from these 2 RAU
Matt