Unable to install watch app to physical device

I am unable to successfully install a watch app from either of two different iOS apps in Xcode 11.5 (one is the SimpleWatchConnectivity WatchKit App that Apple posted).

My watch is paired with the iPhone, and all other data syncs properly. The iPhone is plugged directly into my MacBook Pro, and the watch is inches away, with no discernible issues with wifi or bluetooth.

The iOS app gets installed properly to the iPhone, but Xcode fails when I try to build and run the watch component. I get "Unable to install SimpleWatchConnectivity WatchKit App", and upon hitting details, I get the following error about the device no longer being connected (???)

Any ideas?

---

Unable to install "SimpleWatchConnectivity WatchKit App"
Domain: com.apple.dt.MobileDeviceErrorDomain
Code: -402653052
--
This device is no longer connected.
Domain: com.apple.dt.MobileDeviceErrorDomain
Code: -402653052
User Info: {
    DVTRadarComponentKey = 261622;
    MobileDeviceErrorCode = "(0xE8000084)";
    "com.apple.dtdevicekit.stacktrace" = (
0   DTDeviceKitBase                     0x000000011dd2d81a DTDKCreateNSErrorFromAMDErrorCode + 233
1   DTDeviceKitBase                     0x000000011dd6ef70 __90-[DTDKMobileDeviceToken installApplicationBundleAtPath:withOptions:andError:withCallback:]_block_invoke + 155
2   DVTFoundation                       0x000000010409c155 DVTInvokeWithStrongOwnership + 73
3   DTDeviceKitBase                     0x000000011dd6eca8 -[DTDKMobileDeviceToken installApplicationBundleAtPath:withOptions:andError:withCallback:] + 1654
4   IDEiOSSupportCore                   0x000000011dbe5e91 __118-[DVTiOSDevice(DVTiPhoneApplicationInstallation) processAppInstallSet:appUninstallSet:installOptions:completionBlock:]_block_invoke.352 + 4165
5   DVTFoundation                       0x00000001041cf7f4 __DVT_CALLING_CLIENT_BLOCK__ + 7
6   DVTFoundation                       0x00000001041d1436 __DVTDispatchAsyncblockinvoke + 1194
7   libdispatch.dylib                   0x00007fff73cef6c4 _dispatch_call_block_and_release + 12
8   libdispatch.dylib                   0x00007fff73cf0658 _dispatch_client_callout + 8
9   libdispatch.dylib                   0x00007fff73cf5c44 _dispatch_lane_serial_drain + 597
10  libdispatch.dylib                   0x00007fff73cf65d6 _dispatch_lane_invoke + 363
11  libdispatch.dylib                   0x00007fff73cffc09 _dispatch_workloop_worker_thread + 596
12  libsystem_pthread.dylib             0x00007fff73f4aa3d _pthread_wqthread + 290
13  libsystem_pthread.dylib             0x00007fff73f49b77 start_wqthread + 15
);
}
--
System Information
macOS Version 10.15.5 (Build 19F101)
Xcode 11.5 (16139)