Your ROOT_URL in app.ini is https://git.cloudchain.link/ but you are visiting https://dash.bss.nz/open-source-mirrors/overseerr/src/commit/4c50727a325188fdb5e31cab132d9536f4c1f8b2/docs/extending-overseerr/fail2ban.md You should set ROOT_URL correctly, otherwise the web may not work correctly.
overseerr/docs/extending-overseerr/fail2ban.md

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Fail2ban Filter

{% hint style="warning" %} If you are running Overseerr behind a reverse proxy, make sure that the Enable Proxy Support setting is enabled. {% endhint %}

To use Fail2ban with Overseerr, create a new file named overseerr.local in your Fail2ban filter.d directory with the following filter definition:

[Definition]
failregex = .*\[info\]\[Auth\]\: Failed sign-in attempt.*"ip":"<HOST>"

You can then add a jail using this filter in jail.local. Please see the Fail2ban documetation for details on how to configure the jail.