Outlook OAuth2 can't redirect to application - ios

Question

I'm currently trying use the outlook mail service to obtain contacts/appointments and mails. However I've stumbled upon a problem.
I'm using OAuth2Swift as library to make all my OAuth calls since I'm integrating multiple services.
I created a URL schemelike described in their README
Then I created a Constants file which looks like this
struct Consumer {
let consumerKey: String
let consumerSecret: String
let authorizeURL: String
let accessTokenURL: String
let responseType: String?
let requestTokenURL: String?
}
let Outlook = Consumer(
consumerKey: "",
consumerSecret: "",
authorizeURL: "https://login.microsoftonline.com/common/oauth2/v2.0/authorize",
accessTokenURL: "https://login.microsoftonline.com/common/oauth2/v2.0/token",
responseType: "code",
requestTokenURL: nil)
I created an application for outlook on https://apps.dev.microsoft.com
generated my key and secret and filled them in inside my application.
I added the mobile application platform to my app. Which tells me to use the redirect URI urn:ietf:wg:oauth:2.0:oob
So my code to authorise looks like this
#IBAction func btn_Outlook(_ sender: Any) {
let oauthOU = OAuth2Swift(
consumerKey: Outlook.consumerKey,
consumerSecret: Outlook.consumerSecret,
authorizeUrl: Outlook.authorizeURL,
accessTokenUrl: Outlook.accessTokenURL,
responseType: Outlook.responseType!)
oauthOU.authorizeURLHandler = SafariURLHandler(viewController: self, oauthSwift: oauthOU)
oauthOU.authorize(
withCallbackURL: "urn:ietf:wg:oauth:2.0:oob",
scope: "https://outlook.office.com/Mail.ReadWrite https://outlook.office.com/Mail.Send https://outlook.office.com/Calendars.ReadWrite https://outlook.office.com/Contacts.ReadWrite https://outlook.office.com/Tasks.ReadWrite",
state: state,
success: { credential, response, parameters in
print("logged in with \(credential), with response \(response) and parameters \(parameters)")},
failure: { error in
print("error occured \(error.localizedDescription)")
}
)
}
when I run the code I first get a screen to enter my mail/password. When I enter my mail it will redirect me to a different page/portal where I can enter my password. When I've entered my password it will show me the permissions screen.
as soon as I hit yes it will give me an error saying "Safari cannot open the page because the address is invalid." I'm pretty sure this has to do with the redirect URI but I'm not sure what to do to actually fix this.
I'm hoping someone is able to help me out with this!

Answer 1

I think you forgot to specify the identifier urn:ietf:wg:oauth:2.0:oob in your URL scheme settings (see first image: there is no identifier set)

Answer 2

I think you forgot to handle redirect URI in AppDelegate from OAuthSwift library! You've to handle the callback in AppDelegate as below.
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
if (url.host == "oauth-callback") {
OAuthSwift.handle(url: url)
}
return true
}