Assign specific Exchange Role to App-only authentication with Exchange Online Powershell

I need to use the following cmdlets from ExchangeOnline Powershell module with an unattended connection.

• Get-QuarantineMessage
• Preview-QuarantineMessage
• Release-QuarantineMessage
• Export-QuarantineMessage

1. Following this first documentation https://learn.microsoft.com/en-us/powershell/exchange/app-only-auth-powershell-v2?view=exchange-ps, I created an Azure App registration with self-signed certificate, assigned the "Exchange.ManageAsApp" API permission, then grant consent.

2. Then I created an Azure Security Group and add my application as a member of this group.

3. Then I created a Custom Role in Microsoft 365 Defender portal following this documentation: https://learn.microsoft.com/en-us/defender-for-identity/role-groups

4. In this role, I added the following custom permission:

• Email quarantine (manage)
• Email advanced actions (manage) And Read-Only for Raw Data (Email & collaboration)

5. And of course, I assigned my group created at step 2 to this new role

All of this allow me to use the first 2 cmdlets without any issue but I can't get access to the Export-QuarantineMessage and Release-QuarantineMessage.

We can list permissions needed for this cmdlet through those commands (from there: https://learn.microsoft.com/en-us/powershell/exchange/find-exchange-cmdlet-permissions?view=exchange-ps)

PS > $Perms = Get-ManagementRole -Cmdlet Export-QuarantineMessage
PS > $Perms | foreach {Get-ManagementRoleAssignment -Role $_.Name -Delegating $false | Format-Table -Auto Role,RoleAssigneeType,RoleAssigneeName}

Role           RoleAssigneeType RoleAssigneeName
----           ---------------- ----------------
Security Admin RoleGroup        Organization Management
Security Admin RoleGroup        SecurityAdmins_782500194



Role              RoleAssigneeType RoleAssigneeName
----              ---------------- ----------------
Transport Hygiene RoleGroup        Hygiene Management
Transport Hygiene RoleGroup        Organization Management

I tried this last command :

PS > Add-RoleGroupMember "Hygiene Management" -Member <name of the application created at step 1>

I can see my application member if I run :

PS > Get-RoleGroupMember "Hygiene Management"

But I still don't have access to the the Export-QuarantineMessage and Release-QuarantineMessage cmdlets.

UPDATE

I try the following https://learn.microsoft.com/en-us/powershell/exchange/app-only-auth-powershell-v2?view=exchange-ps#assign-custom-exchange-online-role-groups-to-the-application-using-service-principals

1. Creating a custom Exchange Role with "Transport Hygiene" + "Security Administrator"

2. PS > $AadApp = Get-AzureADServicePrincipal -SearchString ""

   PS > New-ServicePrincipal -AppId $AadApp.AppId -ServiceId $AadApp.ObjectId -DisplayName "ServicePrincipal For my app"

   PS > $SP = Get-ServicePrincipal -Identity "ServicePrincipal For my app"

   PS > Add-RoleGroupMember -Identity "<role created a step 1>" -Member $SP.Identity

Without any luck.

UPDATE Changing my custom Exchange Role with only: -Mailbox Import Export -Mailbox Search -MailboxSearchApplication -Message Tracking -Transport Hygiene -View-Only Configuration -View-Only Recipients seems to work. I will let go the week-end to see if this is not another changes that take time to replicate on microsoft-side