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The recommended tool for resolving formatting issues that may lead to synchronization failures with Azure Active Directory is Microsoft Office 365 IdFix. This tool is specifically designed to identify and correct issues related to directory synchronization, particularly those stemming from improper or non-compliant data formats within your on-premises Active Directory.

When organizations sync their local Active Directory with Azure Active Directory, specific attributes must meet certain formatting requirements. IdFix helps administrators find and remediate problems such as invalid characters, incorrect email addresses, or improperly formatted user attributes. By running IdFix before initiating the synchronization process, organizations can streamline their migration to Azure Active Directory and reduce the likelihood of encountering issues during synchronization.

Other tools mentioned in the options serve different purposes. For instance, Azure Advisor provides personalized best practices and recommendations for optimizing Azure resources; Azure AD Connect Health focuses on monitoring health and performance of Azure AD Connect; and the Password Export Server relates to password management across migration scenarios but does not specifically address formatting issues for synchronization. This differentiation highlights why Microsoft Office 365 IdFix is the most suitable choice for this scenario.