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tfs - Passing release variables between two agent phases

I'm working with TFS on-premise. My issue is that during a release I have two agent phases separated by a manual intervention.

In the first agent phase, I set a variable with:

Write-Verbose $("##vso[task.setvariable variable={0};]{1}" -f $variablename, $variable)

Problem is that in the second agent phase, this variable doesn't exist anymore, even if the same agent is used for the second release phase.

How may I pass a variable between two agent phases during the same release?

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There is no way to persist variables (no matter powershell variables or VSTS user defined variables) between two agent phases (and environments) for now.

And there is a related issue Variables set via logging commands are not persistent between agents, you can follow up.

The work around for now is define the variable again in next agent phase.


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