'MS Teams Error message: Failed to retrieve flag from thread properties. Conversation not found

I am developing azure bot using python sdk v4. From yesterday, this bot is giving below error when i opened personal teams chat with bot on browser

2022-04-12T11:42:47.992Z ConversationsServiceHelper: getChatConversation(): 28:a2146824-9e29-4eff-b4c2-ba6f24c7e235 not found


2022-04-12T11:42:48.123Z meetingCoachService retrieve meetingObjectsConfig failed (threadId 28:a2146824-9e29-4eff-b4c2-ba6f24c7e235, messageId undefined). Error message: Failed to retrieve flag from thread properties. Conversation not found.


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