diff -up openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c.samba-4.22 openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c
--- openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c.samba-4.22	2025-06-11 10:13:16.263459657 +0200
+++ openchange-openchange-2.3-VULCAN/libmapiadmin/mapiadmin_user.c	2025-06-11 10:13:20.049851970 +0200
@@ -332,7 +332,11 @@ static enum MAPISTATUS mapiadmin_samr_co
 	if (!NT_STATUS_IS_OK(status)) {
 		const char *errstr = nt_errstr(status);
 		if (NT_STATUS_EQUAL(status, NT_STATUS_NET_WRITE_FAULT)) {
+			#ifdef SOURCE4_LIBRPC_INTERNALS
 			errstr = dcerpc_errstr(mapiadmin_ctx->user_ctx, mapiadmin_ctx->user_ctx->p->last_fault_code);
+			#else
+			errstr = dcerpc_errstr(mapiadmin_ctx->user_ctx, mapiadmin_ctx->user_ctx->p->internal.last_fault_code);
+			#endif
 		}
 		OC_DEBUG(3, "samr_Connect failed - %s", errstr);
 		return MAPI_E_CALL_FAILED;