iOS OX Drive "Invalid URL" error on day 1 - Am I doing something wrong?

Hey everyone,

Just migrated to Mailbox.org today! Everything is working flawlessly so far, except for the OX Drive app on my iPhone.

I'm stuck at the very first screen. Whenever I enter the Server URL (https://app.mailbox.org or dav.mailbox.org), it instantly throws an "Invalid URL" error.

Here is what I’ve already tried:

• I have a paid account and disabled 2FA.
• It works perfectly on Windows! (So my account is fine).
• Tried with and without https://, and with/without the trailing slash /.
• Made sure there are no auto-capitalized letters or hidden spaces.
• I even tried connecting via the native iOS Files app (WebDAV) but got a "URL is not supported" error.

Is there a specific URL string that the iOS app wants, or is this a known bug? Any workaround would be highly appreciated!