Login failing with ios 13 & xcode 11

I have an application that implemented user login via Active Directory authentication.

Everything was working OK until last week, when I updated Xcode to version 11.0. Now the App with the same code base fails the authentication process.

When the user inputs his/her valid credentials (username / password) the authentication library return an error.

I have some builds that were created before updating Xcode and the authentication works OK on the same phone (with iOS 13).

So … the only variable that changes is the Xcode version and the authentication fails on the App (same basecode, same phone).

I have read a couple of posts of people having authentication issues with Facebook & Google.

Are more people experiencing authentication issues when updating to Xcode v11??

Any hypothesis on the possible cause?