Post a message to a Microsoft Teams channel via Graph

domain: microsoft-graph · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

Delegated auth with ChannelMessage.Send scope (app-only is NOT supported for sending channel messages)
GET /me/joinedTeams and /teams/{id}/channels to resolve ids
POST /teams/{team}/channels/{channel}/messages with body.content (HTML supported)
For workflow-style posting without a user, use an Incoming Webhook / Workflows connector on the channel instead

Known gotchas

Application permissions cannot send channel messages (only migration imports) — use delegated auth or channel webhooks
Incoming Webhooks (O365 connectors) were deprecated 2024+ in favor of Workflows-based webhooks
HTML body is sanitized; unsupported tags are stripped silently

Related routes

Send Outlook mail via Microsoft Graph

microsoft-graph · 4 steps · unrated

Subscribe to Microsoft Graph change notifications (webhooks)

microsoft-graph · 4 steps · unrated

Send a Slack message to a channel via Web API

slack.com · 4 steps · unrated

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