Can't access a note protected by the keychain

"I've been asking and I can get an iPhone 12. Could update this one to the latest version of iOS and proceed with steps provided above? Thanks"

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Loss of Data:

Loss f data is something you would have agreed to upon opening an Apple Account. So, if that was never backed up to iCloud then this is gone. that’s just the way it is :(

90 Day Wait for a New Apple Account Signin:

Do not Sign into your Apple Account on another's Device. Elsewise, the current user with have to wait 90 days to associate it to their own Apple Account. Apple Accounts cannot be merged, nor can they be logged in simultaneously to a device.

"Ok, thanks for the tips. I currently do not have another iPhone besides the one that I lost. I have got a borrowed android phone to keep working with the my number. I'm borrowing a Mac and for now that's the only access I have to mi cloud and details. In fact, I'm using that Mac to reply now. I see that the options you list require me to log my iCloud account from an iPhone, but is there a chance to do it from a Mac computer? It is a big problem for me because I sadly stored important information in that note that is protected by the keychain."

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Getting your Notes:

Keep signed out of that person's Mac. If you have a device of your own, then you can sign into it iCloud, and turn on Passwords in iCloud of the Settings application. So you'll have to get a new Apple device --one that is not associate to anyone's Apple account. This all comes down to accessing your notes on a device that has notes toggled in the same Apple Account as that of your lost iPhone. As long as it is in iCloud, then it would have shown --if Notes was not toggled on, on the iPhone then, sadly it is gone.

See if it Is here: https://www.icloud.com/notes/

Secure your Accounts:

Being that you have lost your device, hacked accounts and info can be of great concern.

A. Verify your Devices:

Verify that all device are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

B. Modify your Credentials:

Having been stollen, someone lily has your credentials. So, by all means, modifying them.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

C. Contact Apple Support:

See if Apple Support can give you assistance with this. Note that these are just user-to-user forums. No on here has access to your Apple Account info (and that is a good thing, BTW).

Apple Contact Us Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary

"Can't access a note protected by the keychain: How can I see note that was protected with the keychain, if I lost my phone and restored my icloud password? now I get this message: This note can’t be viewed because the encryption key wasn’t found in iCloud Keychain. Resetting your end-to-end encrypted data can cause this."

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Some things to Try:

Start with Updating your iPhone:

IMPORTANT: For bug fixes, update your iPhone to iOS27 (which was recently released). IMPORTANT: Create a backup of your iPhone to a computer(Mac or PC), prior to performing the upgrade. That way, you can have something to restore it from, should anything go wrong during or after installing the update.

How to install an Update:

See my User Tips:

• Update your iPhone Using a Computer - User Tip
• Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip

Then...

Try the Following...

A. Turn Off VPNs:

Have Any VPNs turned on? If so, remove them, or keep them, if required for school or work.

B. Enter Past passwords:

Have any recollection of past passwords? Try what comes to mind, as it would be the password you used when you first locked the note.

C. Get iCloud Keychain to Sync Properly:

Ensure iCloud Keychain is turned on:

1. Go to: Settings
2. Tap: [your name] (the very-top item)
3. Tap: iCloud
4. Tap: "See All >" in "Save to iCoud" pane
5. Tap: Passwords & Keychain
6. Toggle On: Sync this iPhone

D. Remove a Lock:

Go Here: How to Lock or Unlock Notes on your iPhone or iPad - Apple Support

Ok, thanks for the tips. I currently do not have another iPhone besides the one that I lost. I have got a borrowed android phone to keep working with the my number. I'm borrowing a Mac and for now that's the only access I have to mi cloud and details. In fact, I'm using that Mac to reply now. I see that the options you list require me to log my iCloud account from an iPhone, but is there a chance to do it from a Mac computer? It is a big problem for me because I sadly stored important information in that note that is protected by the keychain.

I've been asking and I can get an iPhone 12. Could update this one to the latest version of iOS and proceed with steps provided above? Thanks