We resolved my problem. I updated the XCode project(s) in question. The iOS target was changed from 12.0 to 14.0 The only question that remains in my world would explaining why I encountered the problems I was seeing, because I don't understand it.

Here is the FB number: FB15289146 Thank you!

Thanks for your reply... Here is the information you have requested: Request xcrun devicectl list preferredDDI Response Host CoreDevice version: 397.21 The DDI used for the iOS platform: • hostDDI: file:///Library/Developer/DeveloperDiskImages/iOS_DDI.dmg ▿ ddiMetadata: • buildUpdate: 16A242d • contentIsCompatible: true • coreDeviceVersionChecksIncludeDevelopmentRevision: true • developmentRevision: 0 • enforcingCoreDeviceVersionChecks: true • platform: iOS ▿ projectMetadata: • Citrine-94 • CoreDevice-397.21 • DTDeveloperDiskImageSupport-14.0.0 • DTOCMock-23002 • GPUToolsDevice_DDI-300.21 • JetsamProperties-2205 • LiveExecutionResultsLogger-20002 • Mercury-54 • XCTest-23196 • isUsable: true • variant: external The DDI used for the tvOS platform: • hostDDI: file:///Library/Developer/DeveloperDiskImages/tvOS_DDI.dmg ▿ ddiMetadata: • buildUpdate: 16A242d • contentIsCompatible: true • coreDeviceVersionChecksIncludeDevelopmentRevision: true • developmentRevision: 0 • enforcingCoreDeviceVersionChecks: true • platform: tvOS ▿ projectMetadata: • Citrine-94 • CoreDevice-397.21 • DTDeveloperDiskImageSupport-14.0.0 • DTOCMock-23002 • GPUToolsDevice_DDI-300.21 • JetsamProperties-2205 • LiveExecutionResultsLogger-20002 • Mercury-54 • XCTest-23196 • isUsable: true • variant: external The DDI used for the watchOS platform: • hostDDI: file:///Library/Developer/DeveloperDiskImages/watchOS_DDI.dmg ▿ ddiMetadata: • buildUpdate: 16A242d • contentIsCompatible: true • coreDeviceVersionChecksIncludeDevelopmentRevision: true • developmentRevision: 0 • enforcingCoreDeviceVersionChecks: true • platform: watchOS ▿ projectMetadata: • Citrine-94 • CoreDevice-397.21 • DTDeveloperDiskImageSupport-14.0.0 • DTOCMock-23002 • GPUToolsDevice_DDI-300.21 • JetsamProperties-2205 • LiveExecutionResultsLogger-20002 • Mercury-54 • XCTest-23196 • isUsable: true • variant: external The DDI used for the visionOS platform: • hostDDI: file:///Library/Developer/DeveloperDiskImages/xrOS_DDI.dmg ▿ ddiMetadata: • buildUpdate: 16A242d • contentIsCompatible: true • coreDeviceVersionChecksIncludeDevelopmentRevision: true • developmentRevision: 0 • enforcingCoreDeviceVersionChecks: true • platform: xrOS ▿ projectMetadata: • Citrine-94 • CoreDevice-397.21 • DTDeveloperDiskImageSupport-14.0.0 • DTOCMock-23002 • GPUToolsDevice_DDI-300.21 • JetsamProperties-2205 • LiveExecutionResultsLogger-20002 • Mercury-54 • XCTest-23196 • isUsable: true • variant: external Other Request xcrun devicectl device info ddiServices --device <My UDID> Other Response 10:18:53 Acquired tunnel connection to device. 10:18:53 Enabling developer disk image services. ERROR: The developer disk image could not be staged on the host. (com.apple.dt.CoreDeviceError error 12045 (0x2F0D)) NSURL = file:///Library/Developer/DeveloperDiskImages/iOS_DDI.dmg DeviceIdentifier = FC91CD07-395E-4AD4-826B-FECB15FCB740 -------------------------------------------------------------------------------- ERROR: Couldn’t communicate with a helper application. (NSCocoaErrorDomain error 4099 (0x1003)) NSDebugDescription = The connection to service created from an endpoint was invalidated: failed at lookup with error 9 - Bad file descriptor. As far as the sudo chmod 0777 /private/var/tmp, the root user owns that folder. I've also added additional information to the ticket I submitted. Thanks for all that you are doing for me. I'm humbled and am grateful.