Horizon is not working [link]

This means that your permissions are wrong somewhere. Make sure that you have run php artisan horizon as a user that has access to both your repo and to Redis.

Horizon seems to be working, but it’s still showing as inactive. [link]

Run either php artisan package:discover or composer install, then run php artisan horizon:install then php artisan route:cache. Restart your systemd service or restart Horizon. It should now show as active.

Apps using OAuth login show “Something went wrong” page [link]

First, check that OAUTH_ENABLE=1 is set in .env. If the problem persists, try php artisan passport:install to regenerate the storage/oauth-private.key file.

419 Session Expired error [link]

Make sure you have SESSION_DOMAIN, APP_URL and APP_DOMAIN set in your .env.