Error using Get-MsalToken with Azure B2C Instance & custom policy

Hi, I have a B2C instance setup with a custom sign-in policy and I am using the identity experience framework. I am trying to authenticate the user and obtain tokens via an interactive experience. I gave a try as below code.

`$ex = @{}

$ex.Add('domain_hint','myb2c.onmicrosoft.com')

$connectionDetails = @{

'ClientId'    = '5ee249ec-d5d2-43d1-9dfb-xxx911d98073'

'Interactive' = $true

'Scopes' = 'https://myb2c.onmicrosoft.com/xxxf401c-5e10-4977-b70b-721a17596de7/AllAccess'

'authority' = 'https://myb2c.onmicrosoft.com/myb2c.onmicrosoft.com/B2C_1A_signup_signin/oauth2/v2.0/authorize'

'LoginHint' = 'xyz@company.com'

'ExtraQueryParameters' = $ex

}

$token = Get-MsalToken @connectionDetails

Write-Host $token

` However I got error as below

Get-MsalToken : AADSTS50049: Unknown or invalid instance. Trace ID: a01dbd69-ff03-413f-ad2e-1723f3997500 Correlation ID: 28db52d5-0ef8-4056-b5dd-61410826de9e Timestamp: 2021-09-27 13:25:32Z At C:\temp\Untitled2.ps1:17 char:10 $token = Get-MsalToken @connectionDetails

CategoryInfo          : AuthenticationError: (Microsoft.Ident...arameterBuilder:AcquireTokenInteractiveParameterBuilder) [Write-Error], MsalServiceExc 
   eption
     FullyQualifiedErrorId : GetMsalTokenFailureAuthenticationError,Get-MsalToken

Is this flow supported? If so could anybody please help me with this? If there are any e.g. on these lines it would be great. I am using the latest 4.36 version of MSAL.PS

**Update:** If I change the authority url to as 'https://myb2c.onmicrosoft.com/tfp/467xxx97-0c7c-4648-9569-75e51a9967d5/B2C_1A_signup_signin' I get the below error

Get-MsalToken : A authority of type Aad was used at the application and of type B2C at the request level. Please use the same authority type between the 
two. 
At C:\temp\Untitled2.ps1:17 char:10
$token = Get-MsalToken @connectionDetails

CategoryInfo : AuthenticationError: (Microsoft.Ident...arameterBuilder:AcquireTokenInteractiveParameterBuilder) [Write-Error], MsalClientExce ption FullyQualifiedErrorId : GetMsalTokenFailureAuthenticationError,Get-MsalToken

AzureAD / MSAL.PS

Error using Get-MsalToken with Azure B2C Instance & custom policy #40