I was trying to test my first extension and I uploaded it to Developer Hub, however I found a major bug in the extension, so I completely deleted the extension. I updated my code and tried to upload for a few times, however now the validation fails saying that a duplicate addon ID was found. I completely deleted my addon. What should I do? Thanks
You need to change your add-on ID. When you deleted your previous add-on, there was a warning about the old ID not being able to be used in the future.
You can find documentation about IDs in Extension Workshop.
Thank you very much