Fix “Authentication Failed” While Pushing to Azure DevOps Git Repo

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When pushing code to Azure DevOps Git repositories, developers often encounter authentication failed errors. This typically happens when using outdated passwords or incorrect credentials. The most effective solution is to use Personal Access Tokens, which provide secure and reliable authentication for Git operations. The first step to fix authentication issues is generating a Personal Access Token. Navigate to your Azure DevOps organization settings, then go to user settings and select personal access tokens. Click new token, set the scope to code read and write, and immediately copy the generated token as you won't see it again. The second step is clearing cached credentials that may be outdated. On Windows, open Credential Manager and remove entries for git https dev azure com. On macOS, use Keychain Access to delete relevant password entries. On Linux, run git credential-cache exit to clear the credential cache. This ensures fresh authentication prompts. Now when Git prompts for credentials during push operations, use your Azure DevOps email as the username and the Personal Access Token as the password, not your regular password. Git will display the authentication prompt, and after entering the PAT, it will cache these credentials for future use, eliminating authentication failures. If authentication issues persist, verify your PAT scope includes code read and write permissions, check the expiration date, and ensure you have proper repository permissions. For SSH users, verify your SSH keys are correctly configured in Azure DevOps. These comprehensive steps resolve ninety-nine percent of authentication failures, ensuring smooth Git operations with Azure DevOps.