Hello 
I hope ther's a solution or workaround for my issue, with is zombie Project on the list.
It's there on the project list,
blosking the project key I need,
still when trying to open it, i have:
'This project isn't available
It may have been deleted or your permissions may have changed.'
I tried to import the project from CSV, it failed, I deleted it in next step.
Now it shows up on the list , but can't be used.
I can't create create new project with shortname used by that zombie project.
I'm and Site and Org admin, so it's not about the permissions, I think.
I wasn't able to find a option to free my key, delete zombie.
Could you please help me, give me a hand?
Thank you in advance,
Adam