These are general restrictions on methods:
Immutables — The only supported methods for unnamed immutable objects are GET, HEAD, POST, and DELETE; other methods return a 403 (Forbidden) response.
Domains — The only supported methods for domains are GET, HEAD, COPY, PUT, and APPEND. POST and DELETE require cluster administrator credentials and special consideration.
Best practice
If you cannot use the Content UI Overview to create, edit, and delete your domains, use the legacy Admin Console.