Hi @Mario Nunes
see, if you have deleted the project that time related project key also deleted.
If you want to edit the already exist project then you should be choose Edit project not delete the project.
as @Ligia Cindea mentioned above comment might be it works once you have performed Re-indexing.
You need to clear the old key out of the database. But, it's being retained to prevent you damaging your historical data - it's only safe to clear the old key out if you have never moved issues from the deleted project out to anywhere else (or, if you have, you delete them as well)
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot