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We migrated from on-premise TFS server to Azure DevOps. We use TFVC for source control.  Getting following exception 

FATAL: This server requires federated authentication but no mechanism was available to handle it. com.microsoft.tfs.core.exceptions.TFSFederatedAuthException: This server requires federated authentication but no mechanism was available to handle it.

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Azure DevOps uses OAuth to communicate by default. Setting your username and password will not work. You need to generate a Personal Access Token and then pass that in.

For the username pass in .(dot), for the password your generated personal access token.

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