Hi,
It sounds like you're having some trouble adding a new user to your Azure DevOps organization. Here are a few steps and considerations that might help resolve the issue:
Add Users to Your Organization: Follow the steps to add users to your organization and manage their access. Ensure that you are adding users with the correct email addresses and access levels.
If these steps do not resolve the issue, you might want to check the detailed troubleshooting guide on the Azure DevOps documentation for more specific solutions.
Let me know if you need further assistance!