TeamsAudioConferencingPolicy: MeetingInvitePhoneNumbers should be a comma-separated string but is exported as array

[ricmestre]

Description of the issue

Like it already happened on other resources some properties are set in M365DSC as string arrays where the backend actually only accepts comma-separated strings, or M365DSC has the property set as string and the backend expects a string array, in this case this resource has property MeetingInvitePhoneNumbers which is a string in M365DSC, the cmdlets from Teams module also use a string but the backend returns a string array so we might end up with an array in the blueprint so if we try to reapply that config to another tenant it will fail since the cmdlets don't accept an array. Unfortunately I don't have the error message with me but it certainly doesn't work without making the conversion.

I'll send a PR to fix this.

EDIT: Was able to get the error message

Microsoft 365 DSC Version

1.24.424.1

Which workloads are affected

Teams

The DSC configuration

TeamsAudioConferencingPolicy "TeamsAudioConferencingPolicy-Tag:REDACTED"
        {
            AllowTollFreeDialin       = $True;
            Credential                = $Credscredential;
            Ensure                    = "Present";
            Identity                  = "Tag:REDACTED";
            MeetingInvitePhoneNumbers = @("XXXXXXXXX"); # Problem here
        }

Verbose logs showing the problem

Write-NodeMOFFile : Invalid MOF definition for node 'localhost': Exception calling "ValidateInstanceText" with "1" argument(s): "Convert property 'MeetingInvitePhoneNumbers' value from type 'STRING[]' to type   'STRING' failed
At line:29, char:2                                                                                                                                                                                                 Buffer:
onferencingPolicy";
};^
insta
"                                                                                                                                                                                                                  At C
:\Windows\system32\WindowsPowerShell\v1.0\Modules\PSDesiredStateConfiguration\PSDesiredStateConfiguration.psm1:2369 char:21
+ ...             Write-NodeMOFFile $Name $mofNode $Script:NodeInstanceAlia ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (:) [Write-Error], InvalidOperationException
+ FullyQualifiedErrorId : InvalidMOFDefinition,Write-NodeMOFFile

Environment Information + PowerShell Version

N/A