Teams toolkit creates 2 app in azure portal on clicking f5

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The toolkit is following the best practices recommended by Bot Framework: Bot Framework SDK authentication basics - Bot Service | Microsoft Learn

• Keep the Azure AD app registration restricted to its original purpose of service to service application.
• Create an additional Azure AD app for any user to service authentication, for more finite control over disabling authentication connections, rolling secrets, or reusing the Azure AD app with other applications.
  
  

For future issues, the best place to get support for Teams Toolkit is to file an issue at https://github.com/OfficeDev/teamsfx