This issue might occur when the user doesn’t have proper access permissions to access the repositories. This occurs when a user doesn’t have Basic or Basic+TestPlans or Visual Studio Professional or Visual Studio Enterprise access level in Azure DevOps. This is because a user needs to have either basic or above basic level access to see the Azure DevOps Repositories.
To rectify this issue, you can assign a basic access level to user and see whether the user is able to access the Azure DevOps Repositories. If the user is still have issues in accessing the code or getting the below error
TF400409: You do not have licensing rights to access this feature: Code
Steps to resolve TF400409 error message
Remove the user who has access issues from the Organization
Add the user back to the Azure DevOps organization with basic access level
Check whether the user is still having issues in accessing the Repositories, if the issue still persists add the user into Project Administrators or Project Collection Administrators group
The above steps would mostly resolve the TF400409 error message.