Cast issue on app id when running New-CsApplicationAccessPolicy

Question

Cast issue on app id when running New-CsApplicationAccessPolicy

Pradeep Patel 1

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?

Rich Matheisen 47,886 Reputation points

2022-01-25T20:00:57.58+00:00
Which version of PowerShell are you using? Check the contents of the variable "$PSVersionTable".

Can you try using this technique ("splatting") to supply the parameters/values?

$props = @{ identity = 'MeetingsPolicy' appids = '<app-id>' description = 'MeetingsPolicy' } New-CsApplicationAccessPolicy @props
Pradeep Patel 1 Reputation point

2022-01-26T09:51:17.953+00:00
Thanks for replying! So my version is "5.1.19041.1320" so fairly up to date (if not the latest). I've tried your suggestion but its come back with the same error unfortunately :-(

New-CsApplicationAccessPolicy : Unable to cast object of type 'System.Management.Automation.PSListModifier' to type
'System.String'.
At line:6 char:1

New-CsApplicationAccessPolicy @props

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

CategoryInfo : NotSpecified: (:) [New-CsApplicationAccessPolicy], InvalidCastException

FullyQualifiedErrorId : System.InvalidCastException,Microsoft.Rtc.Management.Internal.NewApplicationAccessPolicy
Cmdlet

This is what I have used,

$props = @{
Identity = 'MeetingsPolicy'
AppIds = '<app-id>'
Description = 'MeetingsPolicy'
}
New-CsApplicationAccessPolicy @props

2 answers

Your answer

Rich Matheisen 47,886 Reputation points

2022-01-25T20:00:57.58+00:00

Which version of PowerShell are you using? Check the contents of the variable "$PSVersionTable".

Can you try using this technique ("splatting") to supply the parameters/values?

$props = @{ identity = 'MeetingsPolicy' appids = '<app-id>' description = 'MeetingsPolicy' } New-CsApplicationAccessPolicy @props
Pradeep Patel 1 Reputation point

2022-01-26T09:51:17.953+00:00

Thanks for replying! So my version is "5.1.19041.1320" so fairly up to date (if not the latest). I've tried your suggestion but its come back with the same error unfortunately :-(

New-CsApplicationAccessPolicy : Unable to cast object of type 'System.Management.Automation.PSListModifier' to type
'System.String'.
At line:6 char:1

New-CsApplicationAccessPolicy @props

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

CategoryInfo : NotSpecified: (:) [New-CsApplicationAccessPolicy], InvalidCastException

FullyQualifiedErrorId : System.InvalidCastException,Microsoft.Rtc.Management.Internal.NewApplicationAccessPolicy
Cmdlet

This is what I have used,

$props = @{
Identity = 'MeetingsPolicy'
AppIds = '<app-id>'
Description = 'MeetingsPolicy'
}
New-CsApplicationAccessPolicy @props

Answer 1

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.

Rich Matheisen 47,886 Reputation points

2022-01-27T15:22:32.503+00:00

I wonder; did he (or you) report this problem to Microsoft?

Answer 2

Limitless Technology 39,901

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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Cast issue on app id when running New-CsApplicationAccessPolicy

2 answers

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