In case a project and organization got deleted by mistake, How to recover deleted project and organization in Azure DevOps?
In case a project and organization got deleted by mistake, How to recover deleted project and organization in Azure DevOps?
If your project or organization is deleted within 28 days, you can recover it in a few steps.
For organization, I advise you to check Microsoft documentation.
For projects, it is very simple, regarding Microsoft documentation.
Click overview and there is a category called Recently deleted projects with a list of projects that you can recover.

Enjoy.