I have plenty of developers, working solo on simultaneous projects with WordPress.
Each of the developers has the own dev* account. E.g. dev1, dev2, etc.
For each developer, I have created web domain s*.stage.domain.com. E.g. s1.stage…, s2.stage…, etc.
I wanted to limit developers to create only their own s.stage subdomains, like project1.s1.stage.domain.com, so the developer could not create the project under mask of another developer. E.g. dev1 could create only .s1.stage… subdomains.
But it is not working.
as a dev3, I can create project.s2.stage, while s2.stage web domain exists under dev2 account.