Microsoft to Block Legacy Authentication Protocols by Default in July

Microsoft is enhancing security by default-blocking legacy authentication protocols in Microsoft 365 starting in July 2025. This impacts access to services like SharePoint and OneDrive, and requires administrator consent for third-party app access. While improving security against brute-force and phishing attacks, this change might disrupt workflows, necessitating administrators to prepare and configure admin consent workflows beforehand. The change affects all Microsoft 365 tenants.