What helped for me was in Xcode going to "Settings" > "Accounts" > "Click the associated account" > "Click Manage Certificates".
Once I did this, the crashes loaded properly again without crashes.
SkipH
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Might be off topic, but this is the closest thread that I found related to my problem.
For people running into this issue still, I initially only set [.allowReadWrite] as availablePermission on the UICloudSharingController. Because of this I couldn't invite people over the UICloudSharingController. Adding the .allowPrivate permission fixed this, ending up with: [.allowReadWrite, .allowPrivate].
Hope this helps.