I received a follow up reply from them.
Thank you for getting back to us.
We are happy to hear that has been self-resolved. We would like to let you know that we had specific issues with Dynamic DNS after the release of new account panel. However it seems to be working the time being. We are still fixing and organizing the things in order to avoid such issues in future.
If you experience any issues after it works please contact us back and we will gladly assist you.
In the meantime, should you have any queries, please do not hesitate to contact us.
So there we have it. I'm glad it wasn't anything with pfSense at all.
Thanks