Cast issue on app id when running New-CsApplicationAccessPolicy

Pradeep Patel 1 Reputation point
2022-01-25T17:00:13.147+00:00

Hi,

I've run into an error after following this document (https://learn.microsoft.com/en-us/graph/cloud-communication-online-meeting-application-access-policy) when trying to set up an application access policy in powershell. This is the cmdlet that was run, which produced the error,

New-CsApplicationAccessPolicy -Identity "MeetingsPolicy" -AppIds "<app-id>" -Description "MeetingsPolicy"

The error received in powershell is the following,

"New-CsApplicationAccessPolicy : Unable to cast object of type 'System.Management.Automation.PSListModifier' to type
'System.String'."

Can anyone help shed any light on what is the problem here and how to fix it please?

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  1. Pradeep Patel 1 Reputation point
    2022-01-27T12:04:38.313+00:00

    So it turned out the Microsoft Teams cmdlet module version 3.1.0 has issues in there when installed with no previous version. I had to install the 2.3.2-preview version first, which allowed the cmdlets to work. I then updated this version to 3.1.0 and it works fine.

    So the steps you need to take are the following,
    i) Remove the teams module from powershell,
    Uninstall-Module MicrosoftTeams -Allversions

    ii) Install the older version first,
    Install-Module -Name MicrosoftTeams -RequiredVersion 2.3.2-preview -AllowPrerelease

    iii) Connect to teams
    Connect-MicrosoftTeams

    v) Update to the latest version (Optional)
    Update-Module -Name MicrosoftTeams

    Run cmdlet and it should work now.

    Credit to Marcus Rath for his post here https://blog.matrixpost.net/teams-powershell-several-cmdlet-doesnt-work-errounable-to-cast-object-of-type-system-management-automation-pslistmodifier-to-type-system-string/, which explains the issue in more detail.


  2. Limitless Technology 39,331 Reputation points
    2022-01-28T08:54:17.33+00:00

    Hello PradeepPatel

    Could you verify that you have the lastest Powershell, and Teams Modile versions? It is highly probable the there is some object update missing:

    https://learn.microsoft.com/en-us/microsoftteams/teams-powershell-install

    --------------------------------------------------------------------------------------------------------------------------------

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