What does this mean. I can’t login and have no idea about URLs in settings or where they might be.
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I have the same problem. Just changed from Android where I’ve not had any problems to an iPhone, and when I try to log into the Bitwarden app it says, “An error has occurred. One or more URLs saved in Settings are incorrect. Please revise it and try to log in again.” What’s it on about?!
Did some more web searches and it seems to be an ongoing bug bitwarden are aware of. What worked for me was firstly reinstalling the app, then trying to sign in on bitwarden.eu instead of bitwarden.com. This prompted an ‘unknown user’ error, but when I switched back to bitwarden.com it logged me in fine. 
See solution in this one:
after reading this thread, i specifically finally made a profile just to say that i’m also having this luck.
went to sleep last night with everything running great, now all i’m receiving is the URL error.
i’m on iOS though, if it matters at all.
I have the same problem. I tried one of the suggestions on a different post, where I’d click on “not you?” and change the url to the relevant one then log in again. But when I do so, I just get a loading screen that takes ages, and eventually ends with
“Exception message. The operation was cancelled”
I tried entering my password afterwards regardless, after which, I get another loading screen that says “Loging in…” which runs for a while and eventually ending with the message
“An error has occured
Exception message: The operation was cancelled.”
I tried again after that and got a different error message:
An error has occurred.
Exception message: Failed to connect to vault.bitwarden.com/ (2606:4700:4400::ac40:9334]:443
Regarding error: “An error has occurred. One or more URLs saved in Settings are incorrect. Please revise it and try to log in again.”
I got this error on my Android. I uninstalled Bitwarden app and reinstalled it. Issue disappeared.