3GPP 38.300 v19.3.0 — the document's own text
16.10.2 Network Architecture
The overall NG-RAN architecture specified in clause 4 applies for NR MBS. MBS multicast can only be supported in MCG side in NE-DC and NR-DC scenarios, i.e., only for MN-terminated MCG MRB. The configuration of MBS broadcast on SCG is not supported for the UE.