App registration: Token only works for admin api

Ih all, hope you can help me with this.

I have registered an app in Azure an use its tenant id, client id, an client secret to successfully access the Power BI admin api. However, shouldn't the same token grant me access to the other api's, such as dataset, group etc?

I keep getting 400 errors such as "API is not accessible for application" when attempting to access any other than the admin api.

What am I missing?

Here is my PS function for acquiring the token:

Function GetPowerBiServiceAdminApiToken 
{
    [CmdLetBinding()]
    Param 
    ( 
        [Parameter(Mandatory=$true, Position=0)] [string] $tenantId,
        [Parameter(Mandatory=$true, Position=1)] [string] $clientId,
        [Parameter(Mandatory=$true, Position=2)] [string] $clientSecret
    )

    $requestUri = "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/token"

    $requestBody = @{
        client_id     = $clientId
        client_secret = $clientSecret
        grant_type    = "client_credentials"
        scope         = "https://analysis.windows.net/powerbi/api/.default"
    }

    $tokenResponse = Invoke-RestMethod -Method Post -Uri $requestUri -ContentType "application/x-www-form-urlencoded" -Body $requestBody
    
    return $tokenResponse.access_token
}

And here is a function for retrieving a dataset, which fails with the error message "API is not accessible for application" using the token retrieved above.

Function GetDataset
{
    [CmdLetBinding()]
    Param 
    ( 
        [Parameter(Mandatory=$true, Position=0)] [string] $token,
        [Parameter(Mandatory=$true, Position=1)] [string] $datasetId
    )

    $headers = @{
        Authorization = "Bearer $token"
    }
    
    $url = "https://api.powerbi.com/v1.0/myorg/datasets/$datasetId"
    
    $dataset = Invoke-RestMethod -Uri $url -Headers $headers

    return $dataset
}

Finally, here is a function that gets all datasets through the admin api. It works perfectly using the token:

Function GetAllDatasetsAsAdmin
{
    [CmdLetBinding()]
    Param 
    ( 
        [Parameter(Mandatory=$true, Position=0)] [string] $token
    )

    $headers = @{
        Authorization = "Bearer $token"
    }
    
    $url = "https://api.powerbi.com/v1.0/myorg/admin/datasets"
    
    $datasets = Invoke-RestMethod -Uri $url -Headers $headers

    $datasetCustomObject = @()

    foreach ($dataset in $datasets.value) {
        
        $ds = New-Object PSObject -Property @{
            id        = $dataset.id
            name      = $dataset.name
            workspaceId = $dataset.workspaceId
        }
        
        $datasetCustomObject += $ds
    }
        
    return $datasetCustomObject
}

Cheers, Mike