https://techcommunity.microsoft.com/discussions/teamsdeveloper/teamsbotinstallation-sendmessage---mention-a-user/3715348
TeamsBotInstallation.SendMessage - mention a user | Microsoft Community Hub
I'm trying to send a proactive message that mentions a particular user. I'm already able to send adaptive cards...
a usermicrosoft communitysendmessagementionhub