Cuba vacation as a reason? Biathlon world champion is not allowed to take part in the World Cup. Travelers who have visited the Caribbean island nation since January 12, 2021 are no longer eligible to enter the USA on visa-free travel with ESTA and instead require a regular visa.
Cuba is one of the countries that the US authorities consider to be supporting terrorist activities. Sophie Chauveau won the World Championships in Nove Mesto, Czech Republic, with the French women's relay team.