If you mean the publish build artifact step and you see any warning like this:
##[warning]Directory 'D:\a\1\a' is empty. Nothing will be added to build artifact 'drop'.
You are publishing the default directory: $(Build.ArtifactStagingDirectory)
while your project is not in this directory. You can check it in your publish build artifact task.
If it is the case, you need to add a copy file task to copy the artifact files from the build output path to $(Build.ArtifactStagingDirectory)
.
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