Introduction
If you are setting up a passkey or using one on an iPhone and see the message “This passkey doesn’t sync with other devices,” follow the steps below to create the passkey in iCloud Keychain.
Instructions
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Go to https://mysignins.microsoft.com/security-info and review your current security setup.
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Select Add a new sign-in method.
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Select Passkey as the sign-in method instead of Passkey in Microsoft Authenticator.
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Select Next and follow the prompts until you see the option to Save another way.
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Select iCloud Keychain.
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Select Continue
When prompted, enter your current StarID password.
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Continue through the prompts until you reach the option to name the passkey.
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Leave the default name, and select next" to "Enter a name for the passkey, or leave the default name 'iCloud Keychain' and select next"
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Select Done. Your passkey setup is now complete.