A release already live can be opted into additional DSPs that weren't originally selected.
3.6.1 How it works
From your Madverse dashboard, locate the live release and add the additional store or territory selection. The release is then delivered to the newly added platform(s) following that platform's standard ingestion timeline (see Section 4 for platform-specific timing).
3.6.2 What doesn't change
Adding stores does not affect the release's existing identifiers, streaming history on already-live platforms, or its original release date (2.29) — the original release date is preserved regardless of when a particular platform was added.
Source: MadDesk article 3.6 (3-6)