Skype bot cannot send messages to some group from special day although it works fine before
问题 We have implement a Skype bot using Bot Builder 4. And this bot run smoothly around 2 years. But from recent days some specify groups cannot receive proactive message from the bot. We have traced both production & development environment to narrow down issue as below: Those group cannot receive message all have format as: ...@p2p.thread.skype. When we create new group and add this bot into group (new group have format: ...@thread.skype). The message send successfully to new group. We have get