I believe we were on tbe same cruise, it was the 11 night cruise from Copenhagen to South Hampton. Part way through the cruise we were sailing from one danish port to another and apparently they are not allowed to sell alcohol or have shops open during that time as it's a "domestic cruise"... something like that? I believe customs agents came aboard and told them this, that if they sold liquor etc they would be heavily fined. I was in a WhatsApp group within our cruise group and people were bartering for bottles of wine, inviting others to their room to partake of the wine they had in their rooms and the like
it was so odd to see the bars so quiet that night, bar staff had basically nothing to do, Palo that night could not serve any alcohol, nor could they in the main dining rooms and the stores remained closed as well.