One possible reason why there are no rows going into the second table is that you have the multicast in the wrong place. The multicast needs to happen before the write to the first table. You can think of it as creating an identical copy of every row that comes into the multicast. Then the two results of the multicast go to the first and the second table (one each).

Another possible reason why there are no rows being inserted into the second table is that there is something wrong with the insert (permissions or missing fields or incorrect fields or the like). However, you should see errors if that were the case.