Having the exact same issue, just started tonight. Nothing different in my app to the way it was 2 days ago.
Just a totally unhelpful error code 15 (serverRejectedRequest). Can see my container fine via CloudKit console but the app is not able to connect.
Evening of development lost, very annoying.
Sherpatantra
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Same error here:
lookupMainFuncAddressInMachHeader:71: Invalid Swift entry point data
lookupMainFuncAddressInMachHeader:77: Swift entry point addres could not be determined. Only started occurring since upgrade to Xcode 12.
Same issue here. Most annoying.