Remove-MgGroupConversation does not work

Describe the bug

I am trying to use the Remove-MgGroupConversation command to remove an email from a M365 group mailbox.
I have the proper permissions, however I get the error "ConversationID isn't supported in the context of this operation."

Expected behavior

Email should be deleted and a "HTTP/1.1 204 No Content" should be returned as stated here: https://learn.microsoft.com/en-us/graph/api/group-delete-conversation?view=graph-rest-1.0&tabs=http

How to reproduce

Execute the command with the "-groupid" and "-conversationid" switches.

SDK Version

2.30.0

Latest version known to work for scenario above?

N/A

Known Workarounds

N/A. Calling the graph API directly with a HTTP request or in the graph explorer generates the same reply.

Debug output

Remove-MgGroupConversation_Delete: ConversationId isn't supported in the context of this operation.

Status: 400 (BadRequest)
ErrorCode: ErrorInvalidOperation
Date:

Headers:
Cache-Control : private
Strict-Transport-Security : max-age=31536000
request-id : 717d975e-f807-4edb-8ca7-31d74a1e4fbe
client-request-id : d79542b9-5680-4873-8be1-9a34cb9b72b1
x-ms-ags-diagnostic : {"ServerInfo":{"DataCenter":"North Central US","Slice":"E","Ring":"4","ScaleUnit":"005","RoleInstance":"CH01EPF00077FDB"}}
Date : Thu, 16 Oct 2025 13:41:37 GMT

Recommendation: See service error codes: https://learn.microsoft.com/graph/errors

Configuration

Name Value

---

PSVersion 7.5.2
PSEdition Core
GitCommitId 7.5.2
OS Microsoft Windows 10.0.26100
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0

Other information

No response

Start by reproducing Remove-MgGroupConversation with the -groupid and -conversationid switches on SDK version 2.30.0, then compare the cmdlet request with the linked Microsoft Graph group-delete-conversation documentation. The direct HTTP and Graph Explorer results should help determine whether the issue is in the SDK or the service; done means the documented deletion returns HTTP 204 or the limitation is clearly identified.