Opening the book…
Deletes in Azure are rarely instant or total. Locks abort them halfway, hidden dependents break loudly later, and soft-deleted vaults keep name reservations and bills alive after the group is "gone".
The pre-delete ritual: list what's inside, list locks, check what references the group from outside, and know which resource types in it have soft-delete (Key Vault, Recovery Services, Cognitive/OpenAI accounts).
Microsoft Learn — Key Vault soft-delete — Why deleted vaults linger