Couple things:
- With the AIO variant of Nextcloud Server, the AIO manager expects to have control over many of the global parameters
- In most of the Docker install methods (and some of others as well), one cannot look only at the
config/config.php. Instead use theocc config:list systemcommand as described in the Admin Manual and the support template. This will will show you the merged config.
For local access with AIO see How can I access locally?