It's a beta. There are going to be issues, but what you should do - rather than putting a random post on these forums hoping that someone at Apple will fix the bug for you - is to raise a Feedback Report at: https://feedbackassistant.apple.com then post the FB number here.

When Apple tell you that you can submit apps built with Xcode 16. They usually send out an email a few days before the public release.

Why not raise a suggestion in the normal way? Please do so at https://feedbackassistant.apple.com/ Though, I doubt Apple will do that as there's this whole thing about green messages being SMS and blue being iMessage, so if you can change to other colours, that difference would be hidden.

The Developer Forums are not the place to solicit. Post reported.

Raise your suggestion at: https://feedbackassistant.apple.com/ then post the FB number here.

The Developer Forums aren't really the right place to raise bugs in a new version of an OS. These forums are for third-party developers writing apps for Apple's platforms to discuss issues with their code. You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can link to them.

If your app doesn't use anything that's new in iOS 18 then you can continue to deploy it with Xcode 15.4 on macOS Sonoma. You can't run Xcode 15.4 in Sequoia, and if Swift 6 is causing you issues, you may have to stay on Sonoma until you're ready.

The Developer Forums aren't really the right place to raise bugs in a new version of an OS. These forums are for third-party developers writing apps for Apple's platforms to discuss issues with their code. You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can link to them.

Do you mean your app is already showing a sheet (not the login or logout sheets), and when you try to display the login/logout sheet you get either a warning about presenting multiple sheets or they just don't work properly? What I do is dismiss the already-presented sheet and then show the login/logout sheet. You can do this by changing the other sheets to something like this: .sheet(isPresented: $showImageSelector && !$loginManager.isShowingLogin && !$loginManager.isShowingLogout) { ImageSelector() } I don't know if this is the 'correct' way to do it, but it makes sense to me.

You can edit posts within an hour or so of posting.

I think your carrier has to implement it before you can use it. Check with your carrier.

You should probably raise this as a bug in the usual way. It won't really get progressed if it's only posted in these Developer Forums. You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can link to them.

You need to tell us what happens when "it doesn't work". Do you get an error? Does it attempt to login but fail? What happens?

The Developer Forums aren't the place for soliciting. Get some friends to test your app.

If you've checked everything, searched everywhere for "HK" and "Health" then you might have to ask on the Google forums to see if Firebase is causing this.