Reservations required for ABD river cruise excursions?

[Eastridge]

I recently heard that all ABD river cruises now require advance reservations for the excursions. I know that was required for the Rhine cruise but I thought the Danube didn’t require those.

If you recently went on an ABD Holland, Danube or Rhone cruise, can you confirm that you had to reserve excursions in advance? If so, how far in advance could you reserve?

Thanks