Summary
With RSC ChatMessage.Read.Chat + ChannelMessage.Read.Group, when a user @mentions our bot in a group chat / channel, the inbound Activity at /api/messages arrives with no mention entity:
Activity.Entities = [clientInfo] only; Activity.GetMentions() is empty.- The bot's display name is removed from
Activity.Text (a leading mention disappears entirely; a trailing/embedded one survives only as plain text).
Activity.ChannelData contains only { "tenant": { "id": "..." } }.- Exactly one
POST /api/messages arrives per mention — there is no separate classic mention-carrying delivery.
So the documented filter Activity.GetMentions().Any(m => m.Mentioned.Id == Activity.Recipient.Id) can never match, and the bot cannot tell it was addressed.
The mention IS valid — it resolves to the bot (verified in Graph)
Fetching the same message from Graph with the bot's own app-only token —
GET /v1.0/chats/{chatId}/messages/{messageId} — returns:
"mentions": [
{ "id": 0, "mentionText": "Egritos Bot",
"mentioned": { "application": { "id": "<bot-app-id>" } } }
],
"body": {
"contentType": "html",
"content": "<p><at id=\"0\">Egritos Bot</at> ...</p>"
}So Graph has both the resolved mentioned.application.id (== the bot's app id) and the <at id="0"> markup — but none of it reaches the Bot Framework Activity.
Expected
Per the RSC docs, an @mention message delivered to the bot should carry the mention entity so GetMentions() returns it (the docs' own filtering sample relies on exactly that).
Actual
The mention entity and <at> markup are stripped from the Activity; GetMentions() is empty and the name is gone from Activity.Text, even though the mention resolves to the bot in Graph.
Environment
Microsoft.Agents.Hosting.AspNetCore 1.5.184 (Microsoft 365 Agents SDK, .NET)- Single-tenant bot, RSC consented at install
- Affects both
groupChat and channel
- Reproduced from Windows and Android clients
Question
Is entity-less delivery under RSC expected, or a regression? If the mention entity is not guaranteed in the Activity under RSC, what is the supported way for a bot to detect it was @mentioned in a group chat / channel? (#11106 looks related but was about non-delivery and is resolved; this is specifically about the mention entity being stripped from a delivered message.)
Summary
With RSC
ChatMessage.Read.Chat+ChannelMessage.Read.Group, when a user@mentionsour bot in a group chat / channel, the inbound Activity at/api/messagesarrives with no mention entity:Activity.Entities=[clientInfo]only;Activity.GetMentions()is empty.Activity.Text(a leading mention disappears entirely; a trailing/embedded one survives only as plain text).Activity.ChannelDatacontains only{ "tenant": { "id": "..." } }.POST /api/messagesarrives per mention — there is no separate classic mention-carrying delivery.So the documented filter
Activity.GetMentions().Any(m => m.Mentioned.Id == Activity.Recipient.Id)can never match, and the bot cannot tell it was addressed.The mention IS valid — it resolves to the bot (verified in Graph)
Fetching the same message from Graph with the bot's own app-only token —
GET /v1.0/chats/{chatId}/messages/{messageId}— returns:So Graph has both the resolved
mentioned.application.id(== the bot's app id) and the<at id="0">markup — but none of it reaches the Bot Framework Activity.Expected
Per the RSC docs, an
@mentionmessage delivered to the bot should carry the mention entity soGetMentions()returns it (the docs' own filtering sample relies on exactly that).Actual
The mention entity and
<at>markup are stripped from the Activity;GetMentions()is empty and the name is gone fromActivity.Text, even though the mention resolves to the bot in Graph.Environment
Microsoft.Agents.Hosting.AspNetCore1.5.184 (Microsoft 365 Agents SDK, .NET)groupChatandchannelQuestion
Is entity-less delivery under RSC expected, or a regression? If the mention entity is not guaranteed in the Activity under RSC, what is the supported way for a bot to detect it was
@mentionedin a group chat / channel? (#11106 looks related but was about non-delivery and is resolved; this is specifically about the mention entity being stripped from a delivered message.)