This add-on is in a deprecated state!
The Pi-hole add-on is now deprecated and will no longer be supported, maintained and will not receive future updates or fixes.
Pi-hole used to be a great solution to filter network traffic, but it has been a challenge to keep/get it in a working state as an add-on.
Meanwhile, the AdGuard team published an alternative:
AdGuard Home 12.
AdGuard Home as surpassed Pi-hole in terms of capabilities, features, and stability, and Home Assistant provides a good integration with AdGuard. Above all, the AdGuard Home team has been supportive in developing the add-on.
For those reasons, it is no longer viable to keep maintaining the Pi-hole add-on, which has been problematic at best.
We strongly recommend migrating to the AdGuard Home add-on, which is available in the add-on store.