All channel names have to be unique, so it's not possible to have two channels - one private/uncertified and one public/certified - to have the same name. If you want to re-use the same name as your existing private channel, you'll need to rename the private channel. You may need to re-upload the private channel's Pkg file and re-publish it in order to get the new private channel name to be used, so that it releases the old name. Alternatively you can delete the private channel to release the name.
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