Scanner API Call using PowerShell for multiple PowerBI workspaces - powershell

Question

I'm trying to call a PowerBI GETinfo Scanner API using PowerShell. One of the requirements is to pass multiple workspaces to get the info. Here is the MS doc link :\
https://learn.microsoft.com/en-us/rest/api/power-bi/admin/workspace-info-post-workspace-info#example
However, I'm not able to pass below syntax for API body in PowerShell.
The below syntax to call multiple workspaces in API body is not working :
$auth_body =#{
"workspaces": [
"97d03602-4873-4760-b37e-1563ef5358e3",
"67b7e93a-3fb3-493c-9e41-2c5051008f24"
]
}
I'm only able to pass single workspace and below syntax works :
$auth_body =#{'workspaces' ="3b7e9b1c-bdac-4e46-a39d-1b3d24a0e122"}
Please help me to form the syntax for multiple workspaces. Seems I'm not able to form key value pair inside PowerShell for multiple workspaces
Updated Code after applying MathiasR.Jessen suggestion:
$authority = 'https://login.microsoftonline.com/oauth2/'+ $tenantID
$authResult = Get-AdalToken -Authority $authority -Resource $resourceAppIdURI -ClientID $UId -Clientsecret $password -TenantID $tenantID
$Token=$authResult.AccessToken
#Write-Output "Token: $Token"
$auth_header = #{
'Accept' = "application/json";
'Authorization' = 'Bearer ' +$Token
}
$auth_body = #{
"workspaces" =
#("50c4bd8e-fc75-433e-a0cd-755f9329515e","97d03602-4873-4760-b37e-1563ef5358e3")
}
$uri = "https://api.powerbi.com/v1.0/myorg/admin/workspaces/getInfo"
$all_workspace = (Invoke-RestMethod -Uri $uri –Headers $auth_header -Body $auth_body –Method Post)
And Error Message :
Invoke-RestMethod : The remote server returned an error: (400) Bad Request.
+ ... rkspace1 = (Invoke-RestMethod -Uri $uri –Headers $auth_header -Body $ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
+ FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand
However, It works perfectly if I provide single workspace.

Answer 1

You're mixing PowerShell and JSON syntax.
To define an array in PowerShell, use the #() array subexpression operator:
$auth_body = #{
"workspaces" = #(
"97d03602-4873-4760-b37e-1563ef5358e3",
"67b7e93a-3fb3-493c-9e41-2c5051008f24"
)
}