App crash on 10.3.1 (simulator)

[torianin]

Describe the bug
App crash on 10.3.1 ( Simulator ) when using experimental dev-logout branch

To Reproduce
Steps to reproduce the behavior:

1. Use dev-logout branch
   pod 'AppAuth', :git => 'git@github.com:openid/AppAuth-iOS.git', :branch => 'dev-logout'
2. Run app in iPhone 5s (10.3.1)
3. Crash when the application starts

dyld: Library not loaded: /System/Library/Frameworks/AuthenticationServices.framework/AuthenticationServices Reason: image not found

Expected behavior
App should run without crash

[zboralski]

AppAuth will crash on iOS < 12 because of this... on the master branch as well

[ugenlik]

Same happened to me, it worked fine using simulator but my apps crashed on Crashyltics and Testflight.

You need to go to your Target-> General->Linked Frameworks and Libraries
and add AuthenticationServices.framework then you need to make it optional.