Master or composition?
The master is a particular recording. The composition is the underlying song. Different people can control each.

Publishing relates to the composition: the music and lyrics. Publishing Administration is optional unless you request FRWRD sync consideration. Distribution is a separate, optional service.
The master is a particular recording. The composition is the underlying song. Different people can control each.
A PRO is a performing rights organization. An IPI/CAE identifies a writer or publisher. Writer splits describe authorship; an administration agreement describes what an administrator may collect and administer.
Writer and publisher portions are separate collection categories. Owning a master does not assign composition rights. Your agreements and society rules determine who collects each portion; legal writer names help match registrations correctly.
You can see intake, review, partner processing and evidence-backed registration status. Expressing interest does not enroll you or transfer rights.