Wait for chat reply to continue messaging error in Microsoft Teams Free
You may only send up to 10 messages before the recipient has accepted your chat request. Due to a technical issue in Teams chats, your chat in Teams Free may have been blocked with the following message:
If you encounter this message in your chat, please request that the recipient accept the chat again to resume the conversation. You may only send up to 10 messages before the recipient has accepted your chat request.
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For more help, contact support or ask a question in the Microsoft Teams Community.