return mapResults.entrySet().stream().flatMap(entry -> {
final var groupId = entry.getKey() instanceof RecipientIdentifier.Group g ? g.groupId() : null;
return entry.getValue().stream().map(r -> JsonSendMessageResult.from(r, groupId));
return mapResults.entrySet().stream().flatMap(entry -> {
final var groupId = entry.getKey() instanceof RecipientIdentifier.Group g ? g.groupId() : null;
return entry.getValue().stream().map(r -> JsonSendMessageResult.from(r, groupId));