When published to Azure, my bot does not show a splash message when a new user opens webchat. It works as expected locally via the emulator.
I've replicated this with the "send welcome message to users" sample code https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-send-welcome-message?view=azure-bot-service-4.0&tabs=csharp. Again, this works as described locally using the emulator but when published to Azure, the various events are not fired as compared to the emulator.
All the other subsequent bot functions work fine.
