The "Loading Scenes and Accessories" issues is something Apple needs to address. This issue is extremely frustrating and indicates there is an architectural and design flaw in how Apple designed their Homekit application. I am a big Apple fan - I own Apple stock, own a Mac, iPhone, iPad, iWatch, and 5 Apple TVs - the fact that Apple can not solve this issue to easily reset the Homekit data on the phone is an issue. I am a tech savy individual and after reading discussion boards I have tried countless work arounds:
1. Reseting all Settings on iPhone (at recommendation of associate at the Apple store - this was a headache as I had to reload and set all kinds of settings )
2. Logging in and out of iCloud
3. Rebooting Phone (multiple times)
4. Turnning off and back on Keychain
5. Creating a seperate iCloud account, logging out of my primary account and then logging in with other icloud account, and then logging back in with my primary account)
6. Turning off Home Data in iCloud Settings and turning it back on.
7. Using my Mac to reset my Keychain Datan
8. Deleting and reinstalling the Home App
9. Opening the app and Waiting for 30-45minutes like some people suggested.
None of these solutions worked.
I called Apple support and their answer was "You need to do a total reset on your phone then reload everything" I told them this was not an acceptable answer since the point of Homekit was to make life easier and reseting my phone and reloading, authenticating all my apps etc every time the service was corrupted. The Apple associate on the phone went to get another answer and after 5 minutes on hold i was disconnected. The whole point of "Homekit" and the Apple Home app is to simpliy your life and to make things easier.
Apple needs to come out with a patch or product update to fix this bug and make a setting to reset all Home Data.