# Universal Login redirect fails on iOS builds deployed via signing tool

**URL:** <https://community.auth0.com/t/universal-login-redirect-fails-on-ios-builds-deployed-via-signing-tool/205371>\
**Category:** Get Help\
**Tags:** login-experience\
**Created:** [November 13, 2026, 1:23pm UTC](https://community.auth0.com/t/universal-login-redirect-fails-on-ios-builds-deployed-via-signing-tool/205371 "2026-11-13T13:23:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jordanmitchell](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/jordanmitchell/32/81472_2.png) [@jordanmitchell](https://community.auth0.com/u/jordanmitchell)\
**Post date:** [November 13, 2026, 1:23pm UTC](https://community.auth0.com/t/universal-login-redirect-fails-on-ios-builds-deployed-via-signing-tool/205371/1 "2026-11-13T13:23:16Z")

</div>

We are currently distributing internal test builds of our iOS app to external QA testers without going through TestFlight. While standard development builds authenticate smoothly, our testers are running into an issue where the Auth0 Universal Login fails to redirect back to the application after entering credentials when the build is packaged and deployed via an external [signing tool](https://esigniosipa.com/).

Under normal conditions, our universal links and callback URLs match the registered bundle identifier in the Auth0 dashboard. However, when the package is processed by the signing tool, the provisioning profile adjustments seem to interfere with the custom scheme handling, causing the web authentication session to either stall or throw an invalid redirect error.

Has anyone encountered similar callback verification issues or Keychain sharing breakages when testing IPA files modified by a signing tool? We would love some advice on whether configuring custom URL scheme fallbacks in the tenant settings or adjusting the iOS SDK redirect handler is the recommended approach here.