Create change notification subscription

documented

Create a subscription for Graph change notifications (e.g., channel messages). Endpoints exist in v1.0 and beta depending on resource. ([learn.microsoft.com](https://learn.microsoft.com/en-us/graph/teams-changenotifications-chatmessage?utm_source=openai))

POST /subscriptionsChange Notificationsno implementation yet0 runs

SKILL.md — what a human or an agent should know before calling this action: gotchas, limits, scopes, pagination.

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