Files Connect(ファイルズコネクト) で「認証トークンは期限切れです」エラーが発生する場合、OAuth(オーオース) トークンの有効期限が切れている可能性があります。
これは Salesforce 固有の問題ではなく、OAuth 2.0 に準拠した動作です。
Office 365 のアプリケーションドメインを確認し、設定メニューから外部システムの認証設定を削除して再認証を行ってください。
問題が解決しない場合は、SharePoint (シェアポイント) アプリケーションを削除し、新規作成することも検討してください。
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