Ok, so I found out, that it was an authentification problem. Our databases use the latest mysql and as described <https://github.com/passbolt/passbolt_docker/issues/103|here> we needed to switch to using the native password auth method with ``ALTER USER 'username'@'ip_address' IDENTIFIED WITH mysql_native_password BY 'password';`` . Since Metabase did not need that, I assume that they can support newer versions of MySQL? Maybe something to look into.