Glad if I can help, I appreciate the kind words 
OK, this is not great. It is possible (likely) that something in your ISP’s network is blocking access to the port, and does so in a way that Roon cannot notice (hence why it says “Ready”). I had something similar with Vodafone in Germany. It took me a lot of convincing on phone support to explain to them that this is not how it is supposed to work.
I also note that you have an IPv6 address (the new version of IP addressing). This is normal with TOTALPLAY, they don’t seem to provide IPv4 addresses anymore for residential accounts. Roon added support for IPv6 to ARC in May of 2023, so it is possible that this can be made to work. However, we have seen that there are still issues with some IPv6-only ISPs in some cases. My own experience with IPv6 is limited, though.
Therefore, I am paging @connor from Roon support to look into this. Connor, you investigated TOTALPLAY in January in this post and found out that they are IPv6-only. At the time, this was before IPv6 support was added to Roon.