[Pi-Hole] Pihole app doesn't see any clients

Hi everyone! I’m quite a noob in setting up a home server so I hope this will be a minor and esily fixable issue.

My YunoHost server

Hardware: Dell Optiplex 790
YunoHost version: 4.2.6 (stable)
I have access to my server : Through SSH, through the webadmin
Router model. FritzBox! 7530
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

I installed the pihole app from the Yunohost app section and I immediately ran into some problems. First of all the admin page states pihole running on 127.0.0.1, so I ran “pihole -r” and configured it with the address of my machine on the network (which is 192.168.178.50), but at the end of the script it gives me this error.

  [✓] Supported OS detected
  [i] SELinux not detected
  [i] Performing reconfiguration, skipping download of local repos
  [✓] Resetting repository within /etc/.pihole...
  [✓] Resetting repository within /var/www/html/admin...
  [i] Main Dependency checks...
  [✓] Checking for cron
  [✓] Checking for curl
  [✓] Checking for iputils-ping
  [✓] Checking for lsof
  [✓] Checking for netcat
  [✓] Checking for psmisc
  [i] Checking for sudo (will be installed)
  [✓] Checking for unzip
  [✓] Checking for wget
  [✓] Checking for idn2
  [✓] Checking for sqlite3
  [✓] Checking for libcap2-bin
  [✓] Checking for dns-root-data
  [✓] Checking for libcap2
  [✓] Checking for lighttpd
  [✓] Checking for php7.3-common
  [✓] Checking for php7.3-cgi
  [✓] Checking for php7.3-sqlite3
  [✓] Checking for php7.3-xml
  [✓] Checking for php7.3-json
  [✓] Checking for php7.3-intl
  [i] Processing apt-get install(s) for: sudo, please wait...
------------------------------------------------------------------------------------------------------------------------------------------------------
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

Also this happens when I try and install sudo manually:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 yunohost : Depends: sudo-ldap but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

sudo-ldap is already installed though.

After all this, pihole runs just fine on the admin page with the correct IP, but when I set up my router to use it as my dns, no client shows up. so basically it isn’t blocking anything. I already tried to manually set each of my machines to use pihole as the default dns, no changes.

Thank you very much in advance and sorry for my kinda broken english, as it’s not my main language

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