New-PartnerAccessToken does not return a refresh token under Linux

Steps to reproduce

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We are using New-PartnerAccessToken in a docker container of Ubuntu 18.04. The PowerShell script is run via Azure DevOps agent on PowerShell 6.2.3-1.ubuntu.18.04. When using the following command:

$cspCredentials = New-Object System.Management.Automation.PSCredential ($applicationIdSecret.SecretValueText, $applicationSecret.SecretValue )
    $cspNewTokenParameters = @{
        ApplicationId = $applicationIdSecret.SecretValueText
        Credential = $cspCredentials
        RefreshToken = $refreshTokenSecret.SecretValueText
        Scopes = 'https://api.partnercenter.microsoft.com/user_impersonation'
        ServicePrincipal = $true
        Tenant = $tenantIdSecret.SecretValueText
        ErrorAction = 'Stop'
        ErrorVariable = 'lastError'
    }
    $cspToken = New-PartnerAccessToken @cspNewTokenParameters

The refresh token is not returned in variable $cspToken.RefreshToken. It is empty. $cspToken.AccessToken and other properties in the object are populated. For example CorrelationId : 47e26b5b-1b9a-4a1b-baa4-feb90ecd718c

Expected behavior

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Actual behavior

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Environment

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[marioroy]

Thank you, @slavizh and @isaiahwilliams. We hit a wall today with testing on Linux. The in-memory feature works.

[ghost]

@slavizh with the upcoming release the underlying issue for this issue will be resolved. Also, I am planning to update the documentation to state that both Gnome Keyring and libsecret are requirements for a preseistent token cache when using Linux. If those are not option, then using the in-memory feature is your best option.