Moderna Inc. on Tuesday sought conditional marketing authorization with the European Medicines Agency for use of its COVID-19 vaccine in children aged 6 to 11, coming as French authorities said people under age 30 shouldn’t receive the shot. “This marks our first submission for the use of our vaccine in this age group,” said Stephane Bancel, Chief Executive of Moderna, adding the firm will submit the data to other regulatory agencies around the world. But on Tuesday, the French National Authority for Health (HAS) announced that people under the age of 30 should receive Pfizer’s COVID-19 vaccine instead of Moderna’s shot when possible, citing concerns that Moderna’s vaccine carried a higher risk for heart issues. They stressed the risk of developing the heart condition is “very rare,” according to a translated statement posted on the agency’s website. “Within the population aged under 30, this risk appears to be around five …