------------------------------
># SET ADD TABLE
>  echo 'Subscription set 2 created';
>  echo 'Adding tables to the subscription set';
>  set add table (set id = 2, origin = 1, id = 1000,
>                 full qualified name = 'public.account',
>                 comment = 'Table public.account with primary key');
>...

The id for the table must be unique across all sets.
IOW,try:
  set add table (set id = 2, origin = 1, id = 2000,
                 full qualified name = 'public.account',
                 comment = 'Table public.account with primary key');