New-MgPrivilegedAccessRoleAssignmentRequest : The role assignment request is invalid

Hello,
I want to assign an Azure role PIM to a resource, with MgGraph PowerShell module.
I have all the Ids from my backup.

It works with AzureAD module, with the cmdlet :
Open-AzureADMSPrivilegedRoleAssignmentRequest -ProviderId AzureResources -Schedule $schedule -ResourceId $assignement.ResourceId -RoleDefinitionId $assignement.RoleDefinitionId -SubjectId $assignement.SubjectId -AssignmentState "Eligible" -Type "AdminAdd"

But I try the cmdlet New-MgPrivilegedAccessRoleAssignmentRequest.

Params :

$params = @{
  RoleDefinitionId = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
  ResourceId = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
  SubjectId = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
  AssignmentState = "Eligible"
  Type = "AdminAdd"
  Reason = "Assign an eligible role"
  Schedule = @{
    StartDateTime = Get-Date
    Expiration = @{
      Type = "noExpiration"
    }
  }
}

New-MgPrivilegedAccessRoleAssignmentRequest -PrivilegedAccessId AzureResources -BodyParameter $params

But at the end, I have :
New-MgPrivilegedAccessRoleAssignmentRequest_Create: The role assignment request is invalid.

Did I forget something ?
Thanks a lot !

Full debug log :

DEBUG: [CmdletBeginProcessing]: - New-MgPrivilegedAccessRoleAssignmentRequest begin processing with parameterSet 'Create'.
DEBUG: [Authentication]: - AuthType: 'Delegated', AuthProviderType: 'InteractiveAuthenticationProvider', ContextScope: 'CurrentUser', AppName: 'Microsoft Graph PowerShell'.
DEBUG: [Authentication]: - Scopes: [Application.ReadWrite.All, DelegatedPermissionGrant.ReadWrite.All, Directory.Read.All, Domain.Read.All, Group.Read.All, openid, Policy.Read.All, Policy.Read.ConditionalAccess, Policy.ReadWrite.ConditionalAccess, PrivilegedAccess.Read.AzureAD, PrivilegedAccess.Read.AzureADGroup, PrivilegedAccess.Read.AzureResources, PrivilegedAccess.ReadWrite.AzureResources, profile, RoleAssignmentSchedule.Read.Directory, RoleEligibilitySchedule.Read.Directory, RoleEligibilitySchedule.ReadWrite.Directory, RoleManagement.Read.All, RoleManagement.Read.Directory, RoleManagement.ReadWrite.Directory, User.Read, email].
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
POST

Absolute Uri:
https://graph.microsoft.com/beta/privilegedAccess/AzureResources/roleAssignmentRequests

Headers:
FeatureFlag                   : 00000047
Cache-Control                 : no-store, no-cache
SdkVersion                    : graph-powershell/1.18.0,Graph-dotnet-1.25.1
User-Agent                    : Mozilla/5.0,(Windows NT 10.0; Microsoft Windows 10.0.22621; fr-CA),PowerShell/7.3.1
Accept-Encoding               : gzip

Body:
{
  "type": "AdminAdd",
  "assignmentState": "Eligible",
  "reason": "Assign an eligible role",
  "resourceId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "roleDefinitionId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "subjectId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "schedule": {
    "Expiration": {
      "Type": "noExpiration"
    }
  }
}


DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
BadRequest

Headers:
Transfer-Encoding             : chunked
Vary                          : Accept-Encoding
Strict-Transport-Security     : max-age=31536000
request-id                    : 92964870-86fd-4766-a025-30027d7b71f8
client-request-id             : 92964870-86fd-4766-a025-30027d7b71f8
x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"Canada East","Slice":"E","Ring":"2","ScaleUnit":"001","RoleInstance":"QB1PEPF0000291B"}}
Date                          : Tue, 20 Dec 2022 21:04:31 GMT

Body:
{
  "error": {
    "code": "InvalidRoleAssignmentRequest",
    "message": "The role assignment request is invalid.",
    "innerError": {
      "date": "2022-12-20T21:04:31",
      "request-id": "92964870-86fd-4766-a025-30027d7b71f8",
      "client-request-id": "92964870-86fd-4766-a025-30027d7b71f8"
    }
  }
}


New-MgPrivilegedAccessRoleAssignmentRequest_Create: The role assignment request is invalid.
DEBUG: [CmdletEndProcessing]: - New-MgPrivilegedAccessRoleAssignmentRequest end processing.

No repository file or test is named. Start by reproducing the POST to the beta privilegedAccess/AzureResources/roleAssignmentRequests endpoint with the supplied parameters, then compare it with the working AzureAD cmdlet and the Graph API contract. Done means identifying the invalid request field or prerequisite and documenting a confirmed correction or service-side issue.