Can only access one Mac via Back to my Mac

I have Back to My Mac set up on my home Mac and two Macs at my office. I can successfully connect to one of the Macs at the office from home, but not the other.
Both office Macs are running Mountain Lion, have Back to My Mac enabled with the same iCloud account credentials, and are on the same LAN/router/switch. My home Mac is running 10.7.5 and cannot be upgraded to 10.8 (it's a very old Mac Pro 1,1.)
Because both office Macs are on the same LAN, those Macs can see one another in the Shared Sidebar in Finder, and I can Screen Connect that way, but I can't access the second office Mac from home for some reason.
I've tried stopping/starting Back to My Mac on the troublesome Mac numerous times (as well as my home Mac), and followed the instructions elsewhere on Apple's site to delete all the Back to my Mac Keychains and recycle the connection, but it didn't help.
Because it's a corporate network, I don't have direct access to the router settings (both work Macs complain that NAT-PMP and/or UPnP aren't on, but since I can still connect to one work Mac from home, that doesn't appear to be the problem.) Both Macs are connected exactly to the network the same way, though, so I'm confused as to why one Mac works while the other doesn't.
Are there any other settings I can check or confirm on the problematic Mac? Am I incorrect in assuming I should be able to connect to two different Macs remotely using the same iCloud account? I just assumed all the Macs I have would be connectable via Back to My Mac if they used the same credentials.
Thanks,
R

Hello Robbie,
Thank you so much for the details you provided reguarding the Back to My Mac trouble you are experiencing.  You have taken some really good troubleshooting steps already, but I recommend reviewing the steps in the section titled "Troubleshooting Back to My Mac" in the following article (you can skip the steps you have already gone through):
OS X: Using and troubleshooting Back to My Mac with your iCloud account
http://support.apple.com/kb/HT4907
Thank you for using Apple Support Communities.
Best,
Sheila M.

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