Thank you for wanting to help. I have try it again from newone and now its working. my finaly fault was a stupid config error on my fritz box...
so now its running finaly.. yay ^^
Dont work for me. Letsencrypt can't find a way to my bitwarden duckdns despite my fritzbox has open ports into it. I don't unterstand why and have wastet of time to fix it. It's annoying 😶 . I think the easier way would be if HTTPS is active from the beginning and you only have to replace the certificate with a correct one.