Potential iOS26 regression on AASA file not download on app install

Question

Created Oct ’25

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Our app uses Auth0 with HTTPS callback, we've found the issue where AASA file is not ready immediately when app is initially launched, which is the exact issue from the above link.

The issue seems mostly fixed on later versions on iOS 18, however, we are seeing some indications of a regression on iOS 26. Here's some measurement over the last week.

| Platform          | iOS 18     | iOS 26 |
|---------------|----------|--------|
| Adoption rate | 55%         | 45%    |
| Issue seen      | 1               | 5          |
| Recover?        | Yes           | No       |

This only 1 iOS 18 instance was able to recover after 1 second after the first try, however, all iOS 26 instances were not able to recover in couple tens of seconds and less than 1 minute, the user eventually gave up.

Is there a way to force app to update AASA file?
Are there some iOS setting (like using a VPN) that could potentially downgrade the AASA fetch?

Related Auth0 discussion:

https://community.auth0.com/t/ios-application-not- recognizing-auth0-associated-domain/134847/27

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Answer 1

KSchmitz_H OP

6d

Hi Albert, my team is also experiencing the same issue with users on iOS 26. Here is the link to our app https://apps.apple.com/au/app/hireup/id1484421263. May I suggest us to not create yet another thread for this issue? This will make it harder for developers to keep track of all threads and to find updates. The issue was originally happening on older iOS versions, received an improvement on iOS 18 but seems to have regressed again on iOS 26. This is critical because it is impacting user authentication. I'm hoping for a prompt response from Apple engineers.

Kind Regards, Karolina

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