Remove-MgGroupConversation does not work

[tld6764]

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

[gavinbarron]

Please submit the output when running using the -Debug parameter to better help us diagnose the issue

[tld6764]

Sure, here you go. I removed a bit of the Absolute Uri for confedentiality.
`DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
DELETE

Absolute Uri:
https://graph.microsoft.com/v1.0/groups/2e6........38/conversations/AAQk........Gvu8afzrxO8c%3D

Headers:
FeatureFlag : 00000003
Cache-Control : no-store, no-cache
User-Agent : Mozilla/5.0,(Windows NT 10.0; Microsoft Windows 10.0.26100; en-US),PowerShell/7.5.3
SdkVersion : graph-powershell/2.30.0
client-request-id : f8c01f03-0f14-408b-8778-2272f2d5e5a5
Accept-Encoding : gzip,deflate,br

Body:

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

Status Code:
BadRequest

Headers:
Cache-Control : private
Strict-Transport-Security : max-age=31536000
request-id : 7da2d270-5dee-4e50-a744-7f1fa9eb991e
client-request-id : f8c01f03-0f14-408b-8778-2272f2d5e5a5
x-ms-ags-diagnostic : {"ServerInfo":{"DataCenter":"North Central US","Slice":"E","Ring":"4","ScaleUnit":"001","RoleInstance":"CH01EPF00007314"}}
Date : Tue, 21 Oct 2025 12:21:09 GMT

Body:
{
"error": {
"code": "ErrorInvalidOperation",
"message": "ConversationId isn't supported in the context of this operation."
}
}`

[gavinbarron]

The request looks valid in the way that it's composed, I've escalated this internally to the team that owns the underlying API.