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system variables

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Azure DevOps provides a number of predefined system variables out of the box on hosted build agents. While these have officially always been read-only, informally you’ve previously been able to change the value of a predefined system variable by overwriting it in a pipeline task. However, as of the January 28 2020 DevOps release this is no longer the case. The DevOps team have improved the security of system variables, and as such now actively…