No new Azure DevOps OAuth apps beginning February 2025 - Azure DevOps Blog
Briefly

Starting February 3, 2025, registrations for Azure DevOps OAuth apps will cease as part of a transition towards the Microsoft Identity platform, urging developers to adapt.
Existing Azure DevOps OAuth apps will remain functional until a 2026 end-of-life date, with current developers receiving continued support during the transition to Entra.
Enhanced security features are coming for Azure DevOps OAuth, including multiple overlapping client secrets and a new secret rotation API, but further OAuth development is halted.
As we move towards sunsetting the Azure DevOps OAuth platform, developers are encouraged to shift authentication to accept Entra tokens for all Azure DevOps REST APIs.
Read at Azure DevOps Blog
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