Salesforce (セールスフォース) の URL 変更により「セキュリティキー」と「組み込み Authenticator(オーセンティケーター)」が無効になります。事前に切断をするか他の認証手段を登録し、変更後に再登録を行うことでログイン問題を回避できます。
組織の URL 変更は以下のような場合に起こります。
[私のドメイン] の名前の変更
[私のドメイン] のサフィックスの変更
Sandbox のみ: 拡張ドメインの有効化
Developer Edition 組織、スクラッチ組織、パッチ組織、無料組織、または Trailhead Playground で私のドメインのパーティション分割を有効化
000395185

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