Webdav vault telling me I have the wrong username and password BEFORE I even enter the password

As the title suggests, I’m experiencing a weird problem with the iOS app.

I have a webdav folder there. Whenever i click on the folder, before i even enter the password, a message slides down from the top of the screen telling me i have the wrong username and password.

Even after dismissing the message and entering my password (which i’m 100% sure is accurate), the app will try to “load” for a few seconds (as if it’s unencrypting my folder), and then display the same “wrong username/password” message.

I’m at my wits end trying to figure this out and cannot find anything about it online. Anyone else experiencing this?