I've got the same issue and a slightly more detailed traceback. And this was after regenerating the encryption keys, as OP mentioned. Could not create persistent key blob for 210D96A1-1260-486C-847A-2FB4A4579DF7 : error=Error Domain=com.apple.CoreML Code=8 "Fetching decryption key from server failed: CKRPCError(file: "/app/.build/checkouts/cloudkitrpc/Sources/CKRPC/BatchBuilding.swift", line: 175, code: .remoteError, underlying: Optional(CKRPC.CKRPCRemoteError(proto: _CloudKitRPCProtobuf.Rpcproto_ErrorInfo: message: "Zone does not exist" clientCode: zoneNotFound cloudDbErrorName: "ZONE_NOT_FOUND" loggingDetails { key: "zone" value: "Zone-F8773MR9C7" } ))). Make sure the encryption key was generated with correct team ID." UserInfo={NSLocalizedDescription=Fetching decryption key from server failed: CKRPCError(file: "/app/.build/checkouts/cloudkitrpc/Sources/CKRPC/BatchBuilding.swift", line: 175, code: .remoteError, underlying: Optional(CKRPC.CKRPCRemoteError(proto: _CloudKitRPCProtobuf.Rpcproto_ErrorInfo: message: "Zone does not exist" clientCode: zoneNotFound cloudDbErrorName: "ZONE_NOT_FOUND" loggingDetails { key: "zone" value: "Zone-F8773MR9C7" } ))). Make sure the encryption key was generated with correct team ID.}