How can I use Back to my Mac when my ISP blocks port 1900?

I was just forced to switch ISPs (don't ask...) and it turns out that my new ISP (Astound) lied to me and actually does block port 1900, which means that Back to my Mac (on which I rely) does not work.
Has anyone seen this and found a viable workaround? Preferably one that is easy for my non-technical family to use also, but all suggestions are welcome.
Thank you!

So, I convinced my ISP to open port 1900 and they did, but it's still not working.
I get two messages that make no sense to me, but I hope indicated something that someone here can help me undertstand...
When I open the iCloud preference pane in System Preferences, It says just below the Back to my Mac setting "Configure Router for better performance" - My Airport Extreme is configured with  Back to my Mac and it looks like my account shows a green indicator.
Second, next to the Back to my Mac setting in the iCloud preference pane, there is a button labeled "Details..." When I click that it tells me that "Back to my Mac is not working properly because the DNS server isnt' responding" and suggests I contact my ISP for a different DNS server.
All other internet services - including iCloud services - are working fine. I even tried changing my DNS servers to Google's public DNS servers and nothing changed.
Any suggestions are very much appreciated! Thank you!

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