Yes, the NDA is still there. So here is the fix, without revealing anything about what I'm talking about. It will either be helpful or not needed.

First, reformat your devices and if needed re-install xcode after removing all provisions from your Library/MobileDevice folder. This assumes you screwed up everything as much as I did. Ghost provisions will hang around until a reformat. If they still appear, quit and restart xcode. Then, regenerate all your provisions at the site. You want to start off with no provisions listed, and clean fresh happy device(s).

Remove all but one device from your system. Plug them in somewhere else. Multiple devices confuses xcode. Don't confuse xcode.

One app at a time, add the provision. If you're still using old identities switch to "any device" rather than the ski resort name. Choose the profile. And make sure you've edited your Properties' identifiers so they are *standard* reverse domain, e.g. com.sadun.HelloWorld. Get rid of any previous tagging before the "com" or "org" or whatever.

Then run. If you get The Error, quit xcode. And relaunch. If your settings are right, a quit and restart fixes 95% of all remaining The Error instances. The remaining 5% seem to go away after another quit/restart. Xcode gets confused. Restart unconfuses it.

If anyone from Apple feels this has crossed the line, please contact me and I'll remove the post. I hope I've gone through this enough so that it respects both the word and spirit of the nda.