OpenCloud iOS App Login Error – "Authorization Failed (Error 3: OpenID-Connect Invalid Request)"

Describe the bug:

The OpenCloud iOS app fails to log in with the error "Login error: authorization failed error 3 openid-connect invalid request", while the Android app and browser login work without issues.

Steps to reproduce:

Install OpenCloud on a Yunohost VPS (clean installation).
Configure OpenCloud with default OpenID-Connect settings.
Attempt to log in using the iOS app.
Observe the error: "Login error: authorization failed error 3 openid-connect invalid request".
Note: Nextcloud and OwnCloud on the same server work fine with the iOS app.

Expected behavior:

The iOS app should successfully authenticate and log in, just like the Android app and browser.

Actual behavior:

The iOS app fails to log in and displays the OpenID-Connect error (Error 3).

Setup:

Server: Yunohost VPS (self-hosted)
OpenCloud version: [latest]
iOS app version: [latest]
Android app version: [latest]

Additional context:

The issue persists after multiple clean reinstalls of OpenCloud.
Nextcloud and OwnCloud, installed on the same server, work flawlessly with the iOS app.
No custom modifications were made to OpenCloud or Yunohost.
Logs or additional debugging information can be provided if needed.