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The possible reason why Azure DevOps Pipeline cannot locate git-submodule is that the submodule URLs may be outdated or incorrect. Submodules are essentially separate repositories and their URLs need to be valid and accessible for the pipeline to access them.

The TF401019 error is an error message related to the failed authentication of a user or system while accessing Azure DevOps resources. This error could occur when the pipeline tries to access a submodule but does not have the appropriate permissions or authentication credentials to do so.

To resolve this issue, you may need to check the submodule URLs and ensure that they are correct, accessible, and have the appropriate permissions. You may also need to configure authentication for your pipeline or add the necessary credentials to grant access to the submodules.