Sorry to hear you're facing this issue. Is this for a new or existing azure web app? Can you please share the Azure documentation you followed to setup your deployment?
Here are a few things you can do to troubleshoot the issue:
-Make sure that your repository root has the correct files in your project. Double-check the branch name and repository URL to make sure they are correct. To customize your deployment, include a .deployment file in the repository root.
-Review your web app settings to make sure they are configured correctly. You can check the settings in the "Configuration" section of the web app in the Azure portal. Make sure that the correct runtime stack and version are selected, and that the connection strings and other settings are configured correctly. Also, check the deployment logs to get more details on what might have happened during the deployment
Hope that helps.
-Grace