It’s not working though, as the third device has no data on app launch. I added an item on that device thinking it might trigger the sync and it only has that one item, the others did not sync and more strangely, that one did not appear on the other two devices that were working correctly previously. The other two however, had copies of the app before the TestFlight build. i’m thinking that maybe that’s significant.

Recommend looking at Deploying an iCloud Container's Schema. I ran into the same issue and this looks like it will resolve the issue with the production environment which is used by TestFlight and apps in the App Store.

Good morning, Ed, I appreciate the follow-up and I have updated the sample code such that it stores the color components separately and displays the result in another rectangle. As you said above, this leaves aside the color correctness issue that I was inquiring about, which is the issue that I'm trying to resolve. I'm really looking for a way to store the MapFeature.backgroundColor, such that restoring the color, when the app is in dark appearance, results in the same color.

Thanks for following up, Ed. I'm essentially trying to store the MapFeature icon and color for given places. The issue is that when the color from the MapFeature is used within my app, and the user has the dark appearance selected, the color of the MapFeature appears to be the light appearance version. I'll try to look further at your suggestions, although as you can see in the sample code I provided, this does not appear to occur in colors that originate from the ColorPicker.

I also have an app that uses a share extension that functions correctly on iOS 18, including the recently released iOS 18.7, however it does not work on iOS 26. The share extension is an important component of the app experience and I would really ask that a fix be prioritized for iOS 26.1 and iPadOS 26.1.