Nginx: Request a new SSL certificate fails with certbot

Dear Community

I want to enable HTTPS on my HA by installing/using the Nginx proxy manager Add-on. My Router-IP is NOT accessible from the internet for now, I want it local because there are several things running not as smooth as they can (should?) be. E.g. annoying Popups "you are…!!)

Installation (MariaDB and) Add-on went fine.
I have a proxy host “homeassistant-jhopmann.de” running, added this to my router-dns

… and everything working fine so far.

Now I follow the guide to add HTTPS by “Request a new SSL certificate”.

The logs state as following:

*[11/15/2023] [9:01:05 PM] [Nginx    ] › ℹ  info      Reloading Nginx*
*[11/15/2023] [9:01:10 PM] [SSL      ] › ℹ  info      Requesting Let'sEncrypt certificates for Cert #3: homassistant-jhopmann.com*
*[11/15/2023] [9:01:10 PM] [SSL      ] › ℹ  info      Command: certbot certonly --config "/etc/letsencrypt.ini" --cert-name "npm-3" --agree-tos --authenticator webroot --email "[email protected]" --preferred-challenges "dns,http" --domains "homassistant-jhopmann.com" *
*[11/15/2023] [9:01:17 PM] [Nginx    ] › ℹ  info      Reloading Nginx*
*[11/15/2023] [9:01:17 PM] [Express  ] › ⚠  warning   Command failed: certbot certonly --config "/etc/letsencrypt.ini" --cert-name "npm-3" --agree-tos --authenticator webroot --email "[email protected]" --preferred-challenges "dns,http" --domains "homassistant-jhopmann.com" *
*Saving debug log to /data/logs/letsencrypt/letsencrypt.log*
*Some challenges have failed.*

Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /data/logs/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

I tried to search for the “letsencrypt.log”, but there is none. I do not have letsencrypt. Is this a prerequisite?

(I tried to install … but does not help + no logs too)

Even the path to it does not exists.
I was also not able to find any certbot -installation. So I would assume the command failed because of missing certbot.

But which is needed? I found that even apt-get is not available.

My setup:

Hardware:
Raspberry PI 4

Version core-2023.11.2
Installationstyp Home Assistant OS
Entwicklung false
Supervisor true
Docker true
Benutzer root
Virtuelle Umgebung false
Python-Version 3.11.6
Betriebssystemfamilie Linux
Betriebssystem-Version 6.1.21-v8
CPU-Architektur aarch64
Zeitzone Asia/Bangkok
Konfigurationsverzeichnis /config

Home Assistant Community Store

VERWALTEN

GitHub API ok
GitHub Content ok
GitHub Web ok
GitHub API Calls Remaining 5000
Installed Version 1.33.0
Stage running
Available Repositories 1337
Downloaded Repositories 6
HACS Data ok

Home Assistant Cloud

VERWALTEN

Angemeldet false
Zertifikatsserver erreichbar ok
Authentifizierungsserver erreichbar ok
Home Assistant Cloud erreichbar ok

Home Assistant Supervisor

Host-Betriebssystem Home Assistant OS 11.1
Update-Channel stable
Supervisor-Version supervisor-2023.11.3
Agent-Version 1.6.0
Docker-Version 24.0.6
Speicherplatz gesamt 56.6 GB
Speicherplatz genutzt 8.6 GB
Gesund true
Unterstützt true
Board rpi4-64
Supervisor-API ok
Versions-API ok

Best regards Jörg