okay,
so making sure you do not reveal your actual wan details (local lan doesn’t matter)
Post what you did and the setting you made.
1.How do you access the remote ?
2. Which NGINX did you use ?
3. What is the config ?
4. How is your DuckDNS set up (what guide ?) ?
5. What is your config ?
I understand that due to your ISP/Modem you need to run a specialist setup and it seems to be blowing my own trumpet but I used : -