If a new store's setup failed, or it is still in progress an hour after it started, its setup page offers Delete store. Only the store owner can delete it.
On the store's setup page, select Delete store.
Verify your identity with the code you're asked for, then confirm.
After you verify your identity and confirm, deletion is scheduled for seven days later. The setup page shows the deletion date and offers Cancel deletion until that time. No permanent deletion starts during this window. Once deletion starts, it cannot be cancelled. The store’s web address becomes available again after deletion finishes.