When I try to get a list of files I get a nil in response (Swift 5)

The response method is given both a "response" and "error" object. If "response" isn't set, you should check "error" to see what went wrong with the call.

I handled the error, the problem was with individual scopes. I have selected the options I want and now I get another error.

API auth error - {
".tag" = "missing_scope";
"required_scope" = "files.metadata.read";
}

The 'missing_scope' error indicates that while the app is permitted to use that scope, the particular access token you're using to make the API call does not have that scope granted. Adding a scope to your app via the App Console does not retroactively grant that scope to existing access tokens.

That being the case, to make any API calls that require that scope, you'll need to get a new access token with that scope.

I created a new token for this account, but I still get this error. It's strange that when I log into the application with this account, I see an another token in the Xcode console. I also try to log into the application under other Dropbox accounts and still get this error. Also I tried disabling all active tokens for this app, but it didn't work.
I can't understand what I'm doing wrong, can you explain in more detail what I should do?

I also noticed that although I have checked the boxes for files.content.read and files.metadata.read, the application for some reason does not request access to them.

I even created a new application in AppConsole, made the necessary changes to the Xcode project, but I still get the same error...
API auth error - {
".tag" = "missing_scope";
"required_scope" = "files.metadata.read";
}

When enabling a new scope for an app, make sure you click the "Submit" at the bottom of the page, or else the changes won't take effect.

And, when configuring the app authorization flow, be sure to specify the particular scopes you want to request. When using SwiftyDropbox, that's done by making a ScopeRequest object with the desired scopes in the "scopes" parameter, and passing that to authorizeFromControllerV2 as shown here. That example only includes "account_info.read", but you would want to add "files.metadata.read" to that list, for example.

At what moment should I create a ScopeRequest object?
I try to do this in the Action of the Login button, but at the time of authorization after clicking Alloy, I receive an Error: Optional("Auth flow failed because of inconsistent state.")

Yes, you are right, I created ScopeRequest twice. Sorry for my carelessness. I finally got a list of files! I am very glad)) Thank you very much for your help!