Why Can't I Turn On The Advanced Data Protection?

The update today on Sonoma, iPhone, and iPad is suppose to fix this. This is what the iPhone statement was before I updated. "This update includes important bug fixes and addresses an issue that prevents enabling or disabling Advanced Data Protection."

What’s so weird is that I can’t turn off iCloud and cannot access my iCloud data on any browser, including my own iOS browser, even when I grant access on my trusted device when the prompt to allow or deny appears

Having this same issue. I've removed stale devices from my family account, all devices are running the latest OS, have been rebooted, controlled for network connectivity issues by trying different networks, have a recovery contact and key set, MFA, etc....and yet cannot enable ADP without receiving a generic error that something went wrong. Trying to enable it on my macbook gives a slightly more descript error saying that there was some "server error". I was put into contact with Apple Support over the phone after initiating a chat session and was basically told that "computers do that sometimes".

What happens when you try? Are you getting any error messages? If so, what do they say?

thisisnotbobdylan wrote:

I go through the process until I reach the end where it just shows an error message.

What is the error message?

Thank you! Just checked and am running the update now.

Following up, the update seems to have allowed me to enable ADP. Thank you for pointing out the update!

Advanced Data Protection protects your files on iCloud. If you are not connected to ICloud then it won't work.

Yesterday Apple Support engineers said this is known issue and they are working on it

FatihAlperen wrote:

Yesterday Apple Support engineers said this is known issue and they are working on it

The fix has been released. Update to iOS 17.6.1.