Federal health authorities are urging Americans to reach out to their insurers after reports of some people encountering trouble getting their new COVID-19 vaccine shot for free. Those issues have arisen despite programs and requirements designed to make the shots available at no out-of-pocket cost for all Americans.The hurdles are new to this year's commercial rollout of COVID-19 vaccines from Moderna and Pfizer, which are now listed for more than $100 on the private market. Earlier during the pandemic, vaccines and boosters had all been paid for by the...