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Why are you using DuckDNS with Let’s Encrypt if you also have Nabu Casa? I dropped DuckDNS and LetsEncrypt like warm dung.
I use the Zerotier add-on that creates a software-defined WAN. Using my ZeroTier IP address I can SSH into any server on my LAN and use Samba shares from anywhere I have Internet.
Similarly, I use DWService to allow for remote screen sharing from anywhere I have Internet.
Both are free for home use.