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 source code Bot Builder 4 from Github and add to my project to debug and see below:
I don't know if Skype bot has just changed any rules or restrictions about their service?
I am very pleased and appreciate any sharing from everyone.
This issue is a bug from Skype backend service. The MS team has just confirmed on this github:
This is a confirmed bug on Skype backend side. The issue has been mitigated for the specific bot and the general fix will be rolled out on the first week of January.
https://github.com/microsoft/BotFramework-Services/issues/270#issuecomment-752455967
