The Package ID reserved. You can upload your package with a different package id.

[jiten87]

I am trying to upload a NuGet package and getting the error "The Package ID reserved. You can upload your package with a different package id.".
Also when searching the same getting no package.

[erdembayar]

Please check #11104 (comment)
Short answer: Even you don't find any package still prefix can be already reserved.