Issue Summary

For Mobile Apps, when SAML uses NTLM auth method, it fails with the following error message at the logs:

 [2020-04-14 20:36:07 +0000]: AuthWebViewController.handle(challengeType:protectionSpace:completion:) challengeType: unsupported("NSURLAuthenticationMethodNTLM")).

Only basic auth is supported by mobile apps.

Our documentation at
Jira Server mobile app states:

Login and authentication

The app supports all common Jira user management configurations, including external user directories and SAML single sign-on. Users will need to sign in to use the app, even if your site allows anonymous access.

But it does not mention that we do have restrictions for NTLM.