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For Yu ID
You can remove a passkey by selecting the upper right menu (mark with three lines) > Login information > Manage login method > Change and set login method, and pressing the “Disable” button under “Login with passkey.” -
For Japan Post Official App (JPN ver only)
You can remove a passkey by selecting the lower right Account > Yu ID registered information > Change and set login method, and pressing the “Disable” button under “Login with passkey.”
* The “Disable” button will no longer be displayed after you disable a passkey.