it seems that is going to the appstore to find the app to execute the share but my app is not in the appstore yet. I am using a sandboxed user and a non sandboxed user, I have tried real phones connected to xcode and simulator same effect, looking for how to test my ckshare in testflight thanks
It isn't quite clear to me what you are really asking... Did you mean that the system alerts you that it can't open a CloudKit share (CKShare) when you click the share's link, even though your app exists on the device? If yes, you might check if your app’s Info.plist file needs to contain the CKSharingSupported key with a value of true, as mentioned in the note here.
Best,
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Ziqiao Chen
Worldwide Developer Relations.