I want to get started with microsoft example https://github.com/microsoft/BotBuilder-Samples/tree/main/samples/csharp_dotnetcore/52.teams-messaging-extensions-search-auth-config. I don't have an azure account so I use in "To try this sample -> 4." the registration without azure account. In the next step (5.) i should update appsettings.json. Now I was wondering what to include in code for AAD ConnectionName from OAuth Connection settings on azure. Thanks for your help.
You'll definitely need an Azure account for this, but you can look at the free Microsoft 365 Developer program for this. I think it even gives a dummy Office 365 tenancy - see https://developer.microsoft.com/en-us/microsoft-365/dev-program