Can not Read Keychain On TestFlight

I have a sdk which reads and writes data to keychain everything works fine on local machine. But on testflight it can not read the data it previously wrote. every time app starts it tries to read but fails. I have other apps they works fine with the same sdk and same code on testflight and local. There is keychain access groups in entitlement file. the reason is not entitlement file. Any ideas?

What platform is this? macOS? iOS? Something else?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Can not Read Keychain On TestFlight
 
 
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